Update docs/victoriametrics/changelog/CHANGELOG.md

Co-authored-by: Max Kotliar <mkotlyar@victoriametrics.com>
Signed-off-by: Zhu Jiekun <jiekun@victoriametrics.com>

app/vmagent/main.go

@@ -462,7 +462,9 @@ func requestHandler(w http.ResponseWriter, r *http.Request) bool {
 		return true
 	case "/prometheus/metric-relabel-debug", "/metric-relabel-debug":
 		promscrapeMetricRelabelDebugRequests.Inc()
-		promscrape.WriteMetricRelabelDebug(w, r)
+		rwGlobalRelabelConfigs := remotewrite.GetRemoteWriteRelabelConfigString()
+		rwURLRelabelConfigss := remotewrite.GetURLRelabelConfigString()
+		promscrape.WriteMetricRelabelDebug(w, r, rwGlobalRelabelConfigs, rwURLRelabelConfigss)
 		return true
 	case "/prometheus/target-relabel-debug", "/target-relabel-debug":
 		promscrapeTargetRelabelDebugRequests.Inc()

app/vmagent/remotewrite/relabel.go

@@ -12,6 +12,7 @@ import (
 	"github.com/VictoriaMetrics/metrics"
 	"gopkg.in/yaml.v2"
 
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/fasttime"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/flagutil"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
@@ -82,6 +83,16 @@ func WriteRelabelConfigData(w io.Writer) {
 	_, _ = w.Write(*p)
 }
 
+// GetRemoteWriteRelabelConfigString returns -remoteWrite.relabelConfig contents in string
+func GetRemoteWriteRelabelConfigString() string {
+	var bb bytesutil.ByteBuffer
+	WriteRelabelConfigData(&bb)
+	if bb.Len() == 0 {
+		return ""
+	}
+	return string(bb.B)
+}
+
 // WriteURLRelabelConfigData writes -remoteWrite.urlRelabelConfig contents to w
 func WriteURLRelabelConfigData(w io.Writer) {
 	p := remoteWriteURLRelabelConfigData.Load()
@@ -108,6 +119,24 @@ func WriteURLRelabelConfigData(w io.Writer) {
 	_, _ = w.Write(d)
 }
 
+// GetURLRelabelConfigString returns -remoteWrite.urlRelabelConfig contents in []string
+func GetURLRelabelConfigString() []string {
+	p := remoteWriteURLRelabelConfigData.Load()
+	if p == nil {
+		return nil
+	}
+	var ss []string
+	for i := range *remoteWriteURLs {
+		cfgData := (*p)[i]
+		var cfgDataBytes []byte
+		if cfgData != nil {
+			cfgDataBytes, _ = yaml.Marshal(cfgData)
+		}
+		ss = append(ss, string(cfgDataBytes))
+	}
+	return ss
+}
+
 func reloadRelabelConfigs() {
 	rcs := allRelabelConfigs.Load()
 	if !rcs.isSet() {

app/vmselect/main.go

@@ -538,7 +538,7 @@ func handleStaticAndSimpleRequests(w http.ResponseWriter, r *http.Request, path
 		return true
 	case "/metric-relabel-debug":
 		promscrapeMetricRelabelDebugRequests.Inc()
-		promscrape.WriteMetricRelabelDebug(w, r)
+		promscrape.WriteMetricRelabelDebug(w, r, "", nil)
 		return true
 	case "/target-relabel-debug":
 		promscrapeTargetRelabelDebugRequests.Inc()

docs/victoriametrics/changelog/CHANGELOG.md

@@ -26,6 +26,8 @@ See also [LTS releases](https://docs.victoriametrics.com/victoriametrics/lts-rel
 
 ## tip
 
+* FEATURE: [vmagent](https://docs.victoriametrics.com/victoriametrics/vmagent/): add support for selecting relabel configurations from `-remoteWrite.relabelConfig` and `-remoteWrite.urlRelabelConfig` in the [metrics relabel debug UI](https://docs.victoriametrics.com/victoriametrics/relabeling/#relabel-debugging). See [#9918](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/9918).
+
 * BUGFIX: [stream aggregation](https://docs.victoriametrics.com/victoriametrics/stream-aggregation/): fix issue with producing aggregated samples with identical timestamps between flushes. See PR [#10808](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/10808) for details.
 
 ## [v1.145.0](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.145.0)

lib/promrelabel/debug.go

@@ -9,47 +9,50 @@ import (
 )
 
 // WriteMetricRelabelDebug writes /metric-relabel-debug page to w with the corresponding args.
-func WriteMetricRelabelDebug(w io.Writer, targetID, metric, relabelConfigs, format string, err error) {
-	writeRelabelDebug(w, false, targetID, metric, relabelConfigs, format, err)
+func WriteMetricRelabelDebug(w io.Writer, targetID, metric, relabelConfigs, rwRelabelConfigs string, urlRelabelIndexLength, urlRelabelIndexCurrent int, format string, err error) {
+	writeRelabelDebug(w, false, targetID, metric, relabelConfigs, rwRelabelConfigs, urlRelabelIndexLength, urlRelabelIndexCurrent, format, err)
 }
 
 // WriteTargetRelabelDebug writes /target-relabel-debug page to w with the corresponding args.
 func WriteTargetRelabelDebug(w io.Writer, targetID, metric, relabelConfigs, format string, err error) {
-	writeRelabelDebug(w, true, targetID, metric, relabelConfigs, format, err)
+	writeRelabelDebug(w, true, targetID, metric, relabelConfigs, "", 0, 0, format, err)
 }
 
-func writeRelabelDebug(w io.Writer, isTargetRelabel bool, targetID, metric, relabelConfigs, format string, err error) {
+func writeRelabelDebug(w io.Writer, isTargetRelabel bool, targetID, metric, relabelConfigs, rwRelabelConfigs string, urlRelabelIndexLength, urlRelabelIndexCurrent int, format string, err error) {
 	if metric == "" {
 		metric = "{}"
 	}
 	targetURL := ""
 	if err != nil {
-		WriteRelabelDebugSteps(w, targetURL, targetID, format, nil, metric, relabelConfigs, err)
+		WriteRelabelDebugSteps(w, targetURL, targetID, format, nil, metric, relabelConfigs, rwRelabelConfigs, urlRelabelIndexLength, urlRelabelIndexCurrent, isTargetRelabel, err)
 		return
 	}
 
 	metric, err = normalizeInputLabels(metric)
 	if err != nil {
 		err = fmt.Errorf("cannot parse metric: %w", err)
-		WriteRelabelDebugSteps(w, targetURL, targetID, format, nil, metric, relabelConfigs, err)
+		WriteRelabelDebugSteps(w, targetURL, targetID, format, nil, metric, relabelConfigs, rwRelabelConfigs, urlRelabelIndexLength, urlRelabelIndexCurrent, isTargetRelabel, err)
 		return
 	}
 
 	labels, err := promutil.NewLabelsFromString(metric)
 	if err != nil {
 		err = fmt.Errorf("cannot parse metric: %w", err)
-		WriteRelabelDebugSteps(w, targetURL, targetID, format, nil, metric, relabelConfigs, err)
+		WriteRelabelDebugSteps(w, targetURL, targetID, format, nil, metric, relabelConfigs, rwRelabelConfigs, urlRelabelIndexLength, urlRelabelIndexCurrent, isTargetRelabel, err)
 		return
 	}
-	pcs, err := ParseRelabelConfigsData([]byte(relabelConfigs))
+
+	// merge relabel configs
+	fullRelabelConfigs := relabelConfigs + "\n" + rwRelabelConfigs
+	pcs, err := ParseRelabelConfigsData([]byte(fullRelabelConfigs))
 	if err != nil {
 		err = fmt.Errorf("cannot parse relabel configs: %w", err)
-		WriteRelabelDebugSteps(w, targetURL, targetID, format, nil, metric, relabelConfigs, err)
+		WriteRelabelDebugSteps(w, targetURL, targetID, format, nil, metric, relabelConfigs, rwRelabelConfigs, urlRelabelIndexLength, urlRelabelIndexCurrent, isTargetRelabel, err)
 		return
 	}
 
 	dss, targetURL := newDebugRelabelSteps(pcs, labels, isTargetRelabel)
-	WriteRelabelDebugSteps(w, targetURL, targetID, format, dss, metric, relabelConfigs, nil)
+	WriteRelabelDebugSteps(w, targetURL, targetID, format, dss, metric, relabelConfigs, rwRelabelConfigs, urlRelabelIndexLength, urlRelabelIndexCurrent, isTargetRelabel, nil)
 }
 
 func newDebugRelabelSteps(pcs *ParsedConfigs, labels *promutil.Labels, isTargetRelabel bool) ([]DebugStep, string) {

lib/promrelabel/debug.qtpl

@@ -6,15 +6,15 @@
 
 {% stripspace %}
 
-{% func RelabelDebugSteps(targetURL, targetID, format string, dss []DebugStep, metric, relabelConfigs  string, err error) %}
+{% func RelabelDebugSteps(targetURL, targetID, format string, dss []DebugStep, metric, relabelConfigs, rwRelabelConfigs string, urlRelabelIndexLength, urlRelabelIndexCurrent int, isTargetRelabel bool, err error) %}
   {% if format == "json" %}
-      {%= RelabelDebugStepsJSON(targetURL, targetID, dss, metric, relabelConfigs, err) %}
+      {%= RelabelDebugStepsJSON(targetURL, targetID, dss, metric, relabelConfigs, rwRelabelConfigs, urlRelabelIndexLength, urlRelabelIndexCurrent, isTargetRelabel, err) %}
   {% else %}
-      {%= RelabelDebugStepsHTML(targetURL, targetID, dss, metric, relabelConfigs, err) %}
+      {%= RelabelDebugStepsHTML(targetURL, targetID, dss, metric, relabelConfigs, rwRelabelConfigs, urlRelabelIndexLength, urlRelabelIndexCurrent, isTargetRelabel, err) %}
   {% endif %}
 {% endfunc %}
 
-{% func RelabelDebugStepsHTML(targetURL, targetID string, dss []DebugStep, metric, relabelConfigs string, err error) %}
+{% func RelabelDebugStepsHTML(targetURL, targetID string, dss []DebugStep, metric, relabelConfigs, rwRelabelConfigs string, urlRelabelIndexLength, urlRelabelIndexCurrent int, isTargetRelabel bool, err error) %}
 <!DOCTYPE html>
 <html lang="en">
 <head>
@@ -49,7 +49,7 @@ function submitRelabelDebugForm(e) {
 
         <div class="m-3">
         <form method="POST" onsubmit="submitRelabelDebugForm(event)">
-            {%= relabelDebugFormInputs(metric, relabelConfigs) %}
+            {%= relabelDebugFormInputs(metric, relabelConfigs, rwRelabelConfigs, urlRelabelIndexLength, urlRelabelIndexCurrent, isTargetRelabel) %}
             {% if targetID != "" %}
               <input type="hidden" name="id" value="{%s targetID %}" />
             {% endif %}
@@ -70,12 +70,37 @@ function submitRelabelDebugForm(e) {
 </html>
 {% endfunc %}
 
-{% func relabelDebugFormInputs(metric, relabelConfigs string) %}
+{% func relabelDebugFormInputs(metric, relabelConfigs string, rwRelabelConfigs string, urlRelabelIndexLength, urlRelabelIndexCurrent int, isTargetRelabel bool) %}
     <div>
         Relabel configs:<br/>
         <textarea name="relabel_configs" style="width: 100%; height: 15em; font-family: monospace" class="m-1">{%s relabelConfigs %}</textarea>
     </div>
 
+
+    {% if !isTargetRelabel %}
+    <div>
+        <div class="m-1">
+            Remote write relabel configs:
+            <div class="d-flex align-items-center gap-2 mt-1">
+                {% if urlRelabelIndexLength > 0 %}
+                    <select name="url_relabel_configs_index" class="form-select form-select-sm w-auto">
+                        {% for i := range urlRelabelIndexLength %}
+                            {% if urlRelabelIndexCurrent == i %}
+                                <option value="{%d i %}" selected="selected">remote-write-url-{%d i %}</option>
+                            {% else %}
+                                <option value="{%d i %}">remote-write-url-{%d i %}</option>
+                            {% endif %}
+                        {% endfor %}
+                    </select>
+                    <input type="submit" name="reload_url_relabel_configs" value="Reload" class="btn btn-secondary btn-sm" />
+                {% endif %}
+            </div>
+        </div>
+        <textarea name="remote_write_relabel_configs" style="width: 100%; height: 15em; font-family: monospace" class="m-1">{%s rwRelabelConfigs %}</textarea>
+    </div>
+    {% endif %}
+
+
     <div>
         Labels:<br/>
         <textarea name="metric" style="width: 100%; height: 5em; font-family: monospace" class="m-1">{%s metric %}</textarea>
@@ -151,7 +176,7 @@ function submitRelabelDebugForm(e) {
 {% endif %}
 {% endfunc %}
 
-{% func RelabelDebugStepsJSON(targetURL, targetID string, dss []DebugStep, metric, relabelConfigs string, err error) %}
+{% func RelabelDebugStepsJSON(targetURL, targetID string, dss []DebugStep, metric, relabelConfigs, rwRelabelConfigs string,  urlRelabelIndexLength, urlRelabelIndexCurrent int, isTargetRelabel bool, err error) %}
 {
     {% if err != nil %}
         "status": "error",

lib/promrelabel/debug.qtpl.go

@@ -25,37 +25,37 @@ var (
 )
 
 //line lib/promrelabel/debug.qtpl:9
-func StreamRelabelDebugSteps(qw422016 *qt422016.Writer, targetURL, targetID, format string, dss []DebugStep, metric, relabelConfigs string, err error) {
+func StreamRelabelDebugSteps(qw422016 *qt422016.Writer, targetURL, targetID, format string, dss []DebugStep, metric, relabelConfigs, rwRelabelConfigs string, urlRelabelIndexLength, urlRelabelIndexCurrent int, isTargetRelabel bool, err error) {
 //line lib/promrelabel/debug.qtpl:10
 	if format == "json" {
 //line lib/promrelabel/debug.qtpl:11
-		StreamRelabelDebugStepsJSON(qw422016, targetURL, targetID, dss, metric, relabelConfigs, err)
+		StreamRelabelDebugStepsJSON(qw422016, targetURL, targetID, dss, metric, relabelConfigs, rwRelabelConfigs, urlRelabelIndexLength, urlRelabelIndexCurrent, isTargetRelabel, err)
 //line lib/promrelabel/debug.qtpl:12
 	} else {
 //line lib/promrelabel/debug.qtpl:13
-		StreamRelabelDebugStepsHTML(qw422016, targetURL, targetID, dss, metric, relabelConfigs, err)
+		StreamRelabelDebugStepsHTML(qw422016, targetURL, targetID, dss, metric, relabelConfigs, rwRelabelConfigs, urlRelabelIndexLength, urlRelabelIndexCurrent, isTargetRelabel, err)
 //line lib/promrelabel/debug.qtpl:14
 	}
 //line lib/promrelabel/debug.qtpl:15
 }
 
 //line lib/promrelabel/debug.qtpl:15
-func WriteRelabelDebugSteps(qq422016 qtio422016.Writer, targetURL, targetID, format string, dss []DebugStep, metric, relabelConfigs string, err error) {
+func WriteRelabelDebugSteps(qq422016 qtio422016.Writer, targetURL, targetID, format string, dss []DebugStep, metric, relabelConfigs, rwRelabelConfigs string, urlRelabelIndexLength, urlRelabelIndexCurrent int, isTargetRelabel bool, err error) {
 //line lib/promrelabel/debug.qtpl:15
 	qw422016 := qt422016.AcquireWriter(qq422016)
 //line lib/promrelabel/debug.qtpl:15
-	StreamRelabelDebugSteps(qw422016, targetURL, targetID, format, dss, metric, relabelConfigs, err)
+	StreamRelabelDebugSteps(qw422016, targetURL, targetID, format, dss, metric, relabelConfigs, rwRelabelConfigs, urlRelabelIndexLength, urlRelabelIndexCurrent, isTargetRelabel, err)
 //line lib/promrelabel/debug.qtpl:15
 	qt422016.ReleaseWriter(qw422016)
 //line lib/promrelabel/debug.qtpl:15
 }
 
 //line lib/promrelabel/debug.qtpl:15
-func RelabelDebugSteps(targetURL, targetID, format string, dss []DebugStep, metric, relabelConfigs string, err error) string {
+func RelabelDebugSteps(targetURL, targetID, format string, dss []DebugStep, metric, relabelConfigs, rwRelabelConfigs string, urlRelabelIndexLength, urlRelabelIndexCurrent int, isTargetRelabel bool, err error) string {
 //line lib/promrelabel/debug.qtpl:15
 	qb422016 := qt422016.AcquireByteBuffer()
 //line lib/promrelabel/debug.qtpl:15
-	WriteRelabelDebugSteps(qb422016, targetURL, targetID, format, dss, metric, relabelConfigs, err)
+	WriteRelabelDebugSteps(qb422016, targetURL, targetID, format, dss, metric, relabelConfigs, rwRelabelConfigs, urlRelabelIndexLength, urlRelabelIndexCurrent, isTargetRelabel, err)
 //line lib/promrelabel/debug.qtpl:15
 	qs422016 := string(qb422016.B)
 //line lib/promrelabel/debug.qtpl:15
@@ -66,7 +66,7 @@ func RelabelDebugSteps(targetURL, targetID, format string, dss []DebugStep, metr
 }
 
 //line lib/promrelabel/debug.qtpl:17
-func StreamRelabelDebugStepsHTML(qw422016 *qt422016.Writer, targetURL, targetID string, dss []DebugStep, metric, relabelConfigs string, err error) {
+func StreamRelabelDebugStepsHTML(qw422016 *qt422016.Writer, targetURL, targetID string, dss []DebugStep, metric, relabelConfigs, rwRelabelConfigs string, urlRelabelIndexLength, urlRelabelIndexCurrent int, isTargetRelabel bool, err error) {
 //line lib/promrelabel/debug.qtpl:17
 	qw422016.N().S(`<!DOCTYPE html><html lang="en"><head>`)
 //line lib/promrelabel/debug.qtpl:21
@@ -120,7 +120,7 @@ func StreamRelabelDebugStepsHTML(qw422016 *qt422016.Writer, targetURL, targetID
 //line lib/promrelabel/debug.qtpl:48
 	qw422016.N().S(`<div class="m-3"><form method="POST" onsubmit="submitRelabelDebugForm(event)">`)
 //line lib/promrelabel/debug.qtpl:52
-	streamrelabelDebugFormInputs(qw422016, metric, relabelConfigs)
+	streamrelabelDebugFormInputs(qw422016, metric, relabelConfigs, rwRelabelConfigs, urlRelabelIndexLength, urlRelabelIndexCurrent, isTargetRelabel)
 //line lib/promrelabel/debug.qtpl:53
 	if targetID != "" {
 //line lib/promrelabel/debug.qtpl:53
@@ -153,22 +153,22 @@ func StreamRelabelDebugStepsHTML(qw422016 *qt422016.Writer, targetURL, targetID
 }
 
 //line lib/promrelabel/debug.qtpl:71
-func WriteRelabelDebugStepsHTML(qq422016 qtio422016.Writer, targetURL, targetID string, dss []DebugStep, metric, relabelConfigs string, err error) {
+func WriteRelabelDebugStepsHTML(qq422016 qtio422016.Writer, targetURL, targetID string, dss []DebugStep, metric, relabelConfigs, rwRelabelConfigs string, urlRelabelIndexLength, urlRelabelIndexCurrent int, isTargetRelabel bool, err error) {
 //line lib/promrelabel/debug.qtpl:71
 	qw422016 := qt422016.AcquireWriter(qq422016)
 //line lib/promrelabel/debug.qtpl:71
-	StreamRelabelDebugStepsHTML(qw422016, targetURL, targetID, dss, metric, relabelConfigs, err)
+	StreamRelabelDebugStepsHTML(qw422016, targetURL, targetID, dss, metric, relabelConfigs, rwRelabelConfigs, urlRelabelIndexLength, urlRelabelIndexCurrent, isTargetRelabel, err)
 //line lib/promrelabel/debug.qtpl:71
 	qt422016.ReleaseWriter(qw422016)
 //line lib/promrelabel/debug.qtpl:71
 }
 
 //line lib/promrelabel/debug.qtpl:71
-func RelabelDebugStepsHTML(targetURL, targetID string, dss []DebugStep, metric, relabelConfigs string, err error) string {
+func RelabelDebugStepsHTML(targetURL, targetID string, dss []DebugStep, metric, relabelConfigs, rwRelabelConfigs string, urlRelabelIndexLength, urlRelabelIndexCurrent int, isTargetRelabel bool, err error) string {
 //line lib/promrelabel/debug.qtpl:71
 	qb422016 := qt422016.AcquireByteBuffer()
 //line lib/promrelabel/debug.qtpl:71
-	WriteRelabelDebugStepsHTML(qb422016, targetURL, targetID, dss, metric, relabelConfigs, err)
+	WriteRelabelDebugStepsHTML(qb422016, targetURL, targetID, dss, metric, relabelConfigs, rwRelabelConfigs, urlRelabelIndexLength, urlRelabelIndexCurrent, isTargetRelabel, err)
 //line lib/promrelabel/debug.qtpl:71
 	qs422016 := string(qb422016.B)
 //line lib/promrelabel/debug.qtpl:71
@@ -179,326 +179,378 @@ func RelabelDebugStepsHTML(targetURL, targetID string, dss []DebugStep, metric,
 }
 
 //line lib/promrelabel/debug.qtpl:73
-func streamrelabelDebugFormInputs(qw422016 *qt422016.Writer, metric, relabelConfigs string) {
+func streamrelabelDebugFormInputs(qw422016 *qt422016.Writer, metric, relabelConfigs string, rwRelabelConfigs string, urlRelabelIndexLength, urlRelabelIndexCurrent int, isTargetRelabel bool) {
 //line lib/promrelabel/debug.qtpl:73
 	qw422016.N().S(`<div>Relabel configs:<br/><textarea name="relabel_configs" style="width: 100%; height: 15em; font-family: monospace" class="m-1">`)
 //line lib/promrelabel/debug.qtpl:76
 	qw422016.E().S(relabelConfigs)
 //line lib/promrelabel/debug.qtpl:76
-	qw422016.N().S(`</textarea></div><div>Labels:<br/><textarea name="metric" style="width: 100%; height: 5em; font-family: monospace" class="m-1">`)
-//line lib/promrelabel/debug.qtpl:81
-	qw422016.E().S(metric)
-//line lib/promrelabel/debug.qtpl:81
 	qw422016.N().S(`</textarea></div>`)
-//line lib/promrelabel/debug.qtpl:83
-}
-
-//line lib/promrelabel/debug.qtpl:83
-func writerelabelDebugFormInputs(qq422016 qtio422016.Writer, metric, relabelConfigs string) {
-//line lib/promrelabel/debug.qtpl:83
-	qw422016 := qt422016.AcquireWriter(qq422016)
-//line lib/promrelabel/debug.qtpl:83
-	streamrelabelDebugFormInputs(qw422016, metric, relabelConfigs)
-//line lib/promrelabel/debug.qtpl:83
-	qt422016.ReleaseWriter(qw422016)
-//line lib/promrelabel/debug.qtpl:83
-}
-
-//line lib/promrelabel/debug.qtpl:83
-func relabelDebugFormInputs(metric, relabelConfigs string) string {
-//line lib/promrelabel/debug.qtpl:83
-	qb422016 := qt422016.AcquireByteBuffer()
-//line lib/promrelabel/debug.qtpl:83
-	writerelabelDebugFormInputs(qb422016, metric, relabelConfigs)
-//line lib/promrelabel/debug.qtpl:83
-	qs422016 := string(qb422016.B)
-//line lib/promrelabel/debug.qtpl:83
-	qt422016.ReleaseByteBuffer(qb422016)
-//line lib/promrelabel/debug.qtpl:83
-	return qs422016
-//line lib/promrelabel/debug.qtpl:83
-}
-
+//line lib/promrelabel/debug.qtpl:80
+	if !isTargetRelabel {
+//line lib/promrelabel/debug.qtpl:80
+		qw422016.N().S(`<div><div class="m-1">Remote write relabel configs:<div class="d-flex align-items-center gap-2 mt-1">`)
 //line lib/promrelabel/debug.qtpl:85
-func streamrelabelDebugSteps(qw422016 *qt422016.Writer, dss []DebugStep, targetURL, targetID string) {
-//line lib/promrelabel/debug.qtpl:86
-	if len(dss) > 0 {
-//line lib/promrelabel/debug.qtpl:86
-		qw422016.N().S(`<div class="m-3"><b>Original labels:</b> <samp>`)
+		if urlRelabelIndexLength > 0 {
+//line lib/promrelabel/debug.qtpl:85
+			qw422016.N().S(`<select name="url_relabel_configs_index" class="form-select form-select-sm w-auto">`)
+//line lib/promrelabel/debug.qtpl:87
+			for i := range urlRelabelIndexLength {
 //line lib/promrelabel/debug.qtpl:88
-		streammustFormatLabels(qw422016, dss[0].In)
+				if urlRelabelIndexCurrent == i {
 //line lib/promrelabel/debug.qtpl:88
-		qw422016.N().S(`</samp></div>`)
+					qw422016.N().S(`<option value="`)
+//line lib/promrelabel/debug.qtpl:89
+					qw422016.N().D(i)
+//line lib/promrelabel/debug.qtpl:89
+					qw422016.N().S(`" selected="selected">remote-write-url-`)
+//line lib/promrelabel/debug.qtpl:89
+					qw422016.N().D(i)
+//line lib/promrelabel/debug.qtpl:89
+					qw422016.N().S(`</option>`)
 //line lib/promrelabel/debug.qtpl:90
-	}
+				} else {
 //line lib/promrelabel/debug.qtpl:90
-	qw422016.N().S(`<table class="table table-striped table-hover table-bordered table-sm"><thead><tr><th scope="col" style="width: 5%">Step</th><th scope="col" style="width: 25%">Relabeling Rule</th><th scope="col" style="width: 35%">Input Labels</th><th scope="col" stile="width: 35%">Output labels</a></tr></thead><tbody>`)
+					qw422016.N().S(`<option value="`)
+//line lib/promrelabel/debug.qtpl:91
+					qw422016.N().D(i)
+//line lib/promrelabel/debug.qtpl:91
+					qw422016.N().S(`">remote-write-url-`)
+//line lib/promrelabel/debug.qtpl:91
+					qw422016.N().D(i)
+//line lib/promrelabel/debug.qtpl:91
+					qw422016.N().S(`</option>`)
+//line lib/promrelabel/debug.qtpl:92
+				}
+//line lib/promrelabel/debug.qtpl:93
+			}
+//line lib/promrelabel/debug.qtpl:93
+			qw422016.N().S(`</select><input type="submit" name="reload_url_relabel_configs" value="Reload" class="btn btn-secondary btn-sm" />`)
+//line lib/promrelabel/debug.qtpl:96
+		}
+//line lib/promrelabel/debug.qtpl:96
+		qw422016.N().S(`</div></div><textarea name="remote_write_relabel_configs" style="width: 100%; height: 15em; font-family: monospace" class="m-1">`)
+//line lib/promrelabel/debug.qtpl:99
+		qw422016.E().S(rwRelabelConfigs)
+//line lib/promrelabel/debug.qtpl:99
+		qw422016.N().S(`</textarea></div>`)
 //line lib/promrelabel/debug.qtpl:101
+	}
+//line lib/promrelabel/debug.qtpl:101
+	qw422016.N().S(`<div>Labels:<br/><textarea name="metric" style="width: 100%; height: 5em; font-family: monospace" class="m-1">`)
+//line lib/promrelabel/debug.qtpl:106
+	qw422016.E().S(metric)
+//line lib/promrelabel/debug.qtpl:106
+	qw422016.N().S(`</textarea></div>`)
+//line lib/promrelabel/debug.qtpl:108
+}
+
+//line lib/promrelabel/debug.qtpl:108
+func writerelabelDebugFormInputs(qq422016 qtio422016.Writer, metric, relabelConfigs string, rwRelabelConfigs string, urlRelabelIndexLength, urlRelabelIndexCurrent int, isTargetRelabel bool) {
+//line lib/promrelabel/debug.qtpl:108
+	qw422016 := qt422016.AcquireWriter(qq422016)
+//line lib/promrelabel/debug.qtpl:108
+	streamrelabelDebugFormInputs(qw422016, metric, relabelConfigs, rwRelabelConfigs, urlRelabelIndexLength, urlRelabelIndexCurrent, isTargetRelabel)
+//line lib/promrelabel/debug.qtpl:108
+	qt422016.ReleaseWriter(qw422016)
+//line lib/promrelabel/debug.qtpl:108
+}
+
+//line lib/promrelabel/debug.qtpl:108
+func relabelDebugFormInputs(metric, relabelConfigs string, rwRelabelConfigs string, urlRelabelIndexLength, urlRelabelIndexCurrent int, isTargetRelabel bool) string {
+//line lib/promrelabel/debug.qtpl:108
+	qb422016 := qt422016.AcquireByteBuffer()
+//line lib/promrelabel/debug.qtpl:108
+	writerelabelDebugFormInputs(qb422016, metric, relabelConfigs, rwRelabelConfigs, urlRelabelIndexLength, urlRelabelIndexCurrent, isTargetRelabel)
+//line lib/promrelabel/debug.qtpl:108
+	qs422016 := string(qb422016.B)
+//line lib/promrelabel/debug.qtpl:108
+	qt422016.ReleaseByteBuffer(qb422016)
+//line lib/promrelabel/debug.qtpl:108
+	return qs422016
+//line lib/promrelabel/debug.qtpl:108
+}
+
+//line lib/promrelabel/debug.qtpl:110
+func streamrelabelDebugSteps(qw422016 *qt422016.Writer, dss []DebugStep, targetURL, targetID string) {
+//line lib/promrelabel/debug.qtpl:111
+	if len(dss) > 0 {
+//line lib/promrelabel/debug.qtpl:111
+		qw422016.N().S(`<div class="m-3"><b>Original labels:</b> <samp>`)
+//line lib/promrelabel/debug.qtpl:113
+		streammustFormatLabels(qw422016, dss[0].In)
+//line lib/promrelabel/debug.qtpl:113
+		qw422016.N().S(`</samp></div>`)
+//line lib/promrelabel/debug.qtpl:115
+	}
+//line lib/promrelabel/debug.qtpl:115
+	qw422016.N().S(`<table class="table table-striped table-hover table-bordered table-sm"><thead><tr><th scope="col" style="width: 5%">Step</th><th scope="col" style="width: 25%">Relabeling Rule</th><th scope="col" style="width: 35%">Input Labels</th><th scope="col" stile="width: 35%">Output labels</a></tr></thead><tbody>`)
+//line lib/promrelabel/debug.qtpl:126
 	for i, ds := range dss {
-//line lib/promrelabel/debug.qtpl:103
+//line lib/promrelabel/debug.qtpl:128
 		inLabels, inErr := promutil.NewLabelsFromString(ds.In)
 		outLabels, outErr := promutil.NewLabelsFromString(ds.Out)
 		changedLabels := getChangedLabelNames(inLabels, outLabels)
 
-//line lib/promrelabel/debug.qtpl:106
-		qw422016.N().S(`<tr><td>`)
-//line lib/promrelabel/debug.qtpl:108
-		qw422016.N().D(i)
-//line lib/promrelabel/debug.qtpl:108
-		qw422016.N().S(`</td><td><b><pre class="m-2">`)
-//line lib/promrelabel/debug.qtpl:109
-		qw422016.E().S(ds.Rule)
-//line lib/promrelabel/debug.qtpl:109
-		qw422016.N().S(`</pre></b></td><td>`)
-//line lib/promrelabel/debug.qtpl:111
-		if inErr == nil {
-//line lib/promrelabel/debug.qtpl:111
-			qw422016.N().S(`<div class="m-2" style="font-size: 0.9em" title="deleted and updated labels highlighted in red">`)
-//line lib/promrelabel/debug.qtpl:113
-			streamlabelsWithHighlight(qw422016, inLabels, changedLabels, "#D15757")
-//line lib/promrelabel/debug.qtpl:113
-			qw422016.N().S(`</div>`)
-//line lib/promrelabel/debug.qtpl:115
-		} else {
-//line lib/promrelabel/debug.qtpl:115
-			qw422016.N().S(`<div class="m-2" style="font-size: 0.9em; color: red" title="error parsing input labels"><pre>`)
-//line lib/promrelabel/debug.qtpl:117
-			qw422016.E().S(inErr.Error())
-//line lib/promrelabel/debug.qtpl:117
-			qw422016.N().S(`</pre></div>`)
-//line lib/promrelabel/debug.qtpl:119
-			break
-//line lib/promrelabel/debug.qtpl:120
-		}
-//line lib/promrelabel/debug.qtpl:120
-		qw422016.N().S(`</td><td>`)
-//line lib/promrelabel/debug.qtpl:123
-		if outErr == nil {
-//line lib/promrelabel/debug.qtpl:123
-			qw422016.N().S(`<div class="m-2" style="font-size: 0.9em" title="added and updated labels highlighted in blue">`)
-//line lib/promrelabel/debug.qtpl:125
-			streamlabelsWithHighlight(qw422016, outLabels, changedLabels, "#4495e0")
-//line lib/promrelabel/debug.qtpl:125
-			qw422016.N().S(`</div>`)
-//line lib/promrelabel/debug.qtpl:127
-		} else {
-//line lib/promrelabel/debug.qtpl:127
-			qw422016.N().S(`<div class="m-2" style="font-size: 0.9em; color: red" title="error parsing output labels"><pre>`)
-//line lib/promrelabel/debug.qtpl:129
-			qw422016.E().S(outErr.Error())
-//line lib/promrelabel/debug.qtpl:129
-			qw422016.N().S(`</pre></div>`)
 //line lib/promrelabel/debug.qtpl:131
-			break
-//line lib/promrelabel/debug.qtpl:132
-		}
-//line lib/promrelabel/debug.qtpl:132
-		qw422016.N().S(`</td></tr>`)
-//line lib/promrelabel/debug.qtpl:135
-	}
-//line lib/promrelabel/debug.qtpl:135
-	qw422016.N().S(`</tbody></table>`)
+		qw422016.N().S(`<tr><td>`)
+//line lib/promrelabel/debug.qtpl:133
+		qw422016.N().D(i)
+//line lib/promrelabel/debug.qtpl:133
+		qw422016.N().S(`</td><td><b><pre class="m-2">`)
+//line lib/promrelabel/debug.qtpl:134
+		qw422016.E().S(ds.Rule)
+//line lib/promrelabel/debug.qtpl:134
+		qw422016.N().S(`</pre></b></td><td>`)
+//line lib/promrelabel/debug.qtpl:136
+		if inErr == nil {
+//line lib/promrelabel/debug.qtpl:136
+			qw422016.N().S(`<div class="m-2" style="font-size: 0.9em" title="deleted and updated labels highlighted in red">`)
 //line lib/promrelabel/debug.qtpl:138
-	if len(dss) > 0 {
+			streamlabelsWithHighlight(qw422016, inLabels, changedLabels, "#D15757")
 //line lib/promrelabel/debug.qtpl:138
-		qw422016.N().S(`<div class="m-3"><b>Resulting labels:</b> <samp>`)
-//line lib/promrelabel/debug.qtpl:140
-		streammustFormatLabels(qw422016, dss[len(dss)-1].Out)
-//line lib/promrelabel/debug.qtpl:140
-		qw422016.N().S(`</samp>`)
-//line lib/promrelabel/debug.qtpl:141
-		if targetURL != "" {
-//line lib/promrelabel/debug.qtpl:141
-			qw422016.N().S(`<div><b>Target URL:</b>`)
-//line lib/promrelabel/debug.qtpl:143
-			qw422016.N().S(` `)
-//line lib/promrelabel/debug.qtpl:143
-			qw422016.N().S(`<a href="`)
-//line lib/promrelabel/debug.qtpl:143
-			qw422016.E().S(targetURL)
-//line lib/promrelabel/debug.qtpl:143
-			qw422016.N().S(`" target="_blank">`)
-//line lib/promrelabel/debug.qtpl:143
-			qw422016.E().S(targetURL)
-//line lib/promrelabel/debug.qtpl:143
-			qw422016.N().S(`</a>`)
-//line lib/promrelabel/debug.qtpl:144
-			if targetID != "" {
-//line lib/promrelabel/debug.qtpl:145
-				qw422016.N().S(` `)
-//line lib/promrelabel/debug.qtpl:145
-				qw422016.N().S(`(<a href="target_response?id=`)
-//line lib/promrelabel/debug.qtpl:146
-				qw422016.E().S(targetID)
-//line lib/promrelabel/debug.qtpl:146
-				qw422016.N().S(`" target="_blank" title="click to fetch target response on behalf of the scraper">response</a>)`)
-//line lib/promrelabel/debug.qtpl:147
-			}
-//line lib/promrelabel/debug.qtpl:147
 			qw422016.N().S(`</div>`)
-//line lib/promrelabel/debug.qtpl:149
+//line lib/promrelabel/debug.qtpl:140
+		} else {
+//line lib/promrelabel/debug.qtpl:140
+			qw422016.N().S(`<div class="m-2" style="font-size: 0.9em; color: red" title="error parsing input labels"><pre>`)
+//line lib/promrelabel/debug.qtpl:142
+			qw422016.E().S(inErr.Error())
+//line lib/promrelabel/debug.qtpl:142
+			qw422016.N().S(`</pre></div>`)
+//line lib/promrelabel/debug.qtpl:144
+			break
+//line lib/promrelabel/debug.qtpl:145
 		}
-//line lib/promrelabel/debug.qtpl:149
-		qw422016.N().S(`</div>`)
-//line lib/promrelabel/debug.qtpl:151
-	}
+//line lib/promrelabel/debug.qtpl:145
+		qw422016.N().S(`</td><td>`)
+//line lib/promrelabel/debug.qtpl:148
+		if outErr == nil {
+//line lib/promrelabel/debug.qtpl:148
+			qw422016.N().S(`<div class="m-2" style="font-size: 0.9em" title="added and updated labels highlighted in blue">`)
+//line lib/promrelabel/debug.qtpl:150
+			streamlabelsWithHighlight(qw422016, outLabels, changedLabels, "#4495e0")
+//line lib/promrelabel/debug.qtpl:150
+			qw422016.N().S(`</div>`)
 //line lib/promrelabel/debug.qtpl:152
-}
-
+		} else {
 //line lib/promrelabel/debug.qtpl:152
-func writerelabelDebugSteps(qq422016 qtio422016.Writer, dss []DebugStep, targetURL, targetID string) {
-//line lib/promrelabel/debug.qtpl:152
-	qw422016 := qt422016.AcquireWriter(qq422016)
-//line lib/promrelabel/debug.qtpl:152
-	streamrelabelDebugSteps(qw422016, dss, targetURL, targetID)
-//line lib/promrelabel/debug.qtpl:152
-	qt422016.ReleaseWriter(qw422016)
-//line lib/promrelabel/debug.qtpl:152
-}
-
-//line lib/promrelabel/debug.qtpl:152
-func relabelDebugSteps(dss []DebugStep, targetURL, targetID string) string {
-//line lib/promrelabel/debug.qtpl:152
-	qb422016 := qt422016.AcquireByteBuffer()
-//line lib/promrelabel/debug.qtpl:152
-	writerelabelDebugSteps(qb422016, dss, targetURL, targetID)
-//line lib/promrelabel/debug.qtpl:152
-	qs422016 := string(qb422016.B)
-//line lib/promrelabel/debug.qtpl:152
-	qt422016.ReleaseByteBuffer(qb422016)
-//line lib/promrelabel/debug.qtpl:152
-	return qs422016
-//line lib/promrelabel/debug.qtpl:152
-}
-
+			qw422016.N().S(`<div class="m-2" style="font-size: 0.9em; color: red" title="error parsing output labels"><pre>`)
 //line lib/promrelabel/debug.qtpl:154
-func StreamRelabelDebugStepsJSON(qw422016 *qt422016.Writer, targetURL, targetID string, dss []DebugStep, metric, relabelConfigs string, err error) {
+			qw422016.E().S(outErr.Error())
 //line lib/promrelabel/debug.qtpl:154
-	qw422016.N().S(`{`)
+			qw422016.N().S(`</pre></div>`)
 //line lib/promrelabel/debug.qtpl:156
-	if err != nil {
-//line lib/promrelabel/debug.qtpl:156
-		qw422016.N().S(`"status": "error","error":`)
-//line lib/promrelabel/debug.qtpl:158
-		qw422016.N().Q(fmt.Sprintf("Error: %s", err))
-//line lib/promrelabel/debug.qtpl:159
-	} else {
+			break
+//line lib/promrelabel/debug.qtpl:157
+		}
+//line lib/promrelabel/debug.qtpl:157
+		qw422016.N().S(`</td></tr>`)
 //line lib/promrelabel/debug.qtpl:160
+	}
+//line lib/promrelabel/debug.qtpl:160
+	qw422016.N().S(`</tbody></table>`)
+//line lib/promrelabel/debug.qtpl:163
+	if len(dss) > 0 {
+//line lib/promrelabel/debug.qtpl:163
+		qw422016.N().S(`<div class="m-3"><b>Resulting labels:</b> <samp>`)
+//line lib/promrelabel/debug.qtpl:165
+		streammustFormatLabels(qw422016, dss[len(dss)-1].Out)
+//line lib/promrelabel/debug.qtpl:165
+		qw422016.N().S(`</samp>`)
+//line lib/promrelabel/debug.qtpl:166
+		if targetURL != "" {
+//line lib/promrelabel/debug.qtpl:166
+			qw422016.N().S(`<div><b>Target URL:</b>`)
+//line lib/promrelabel/debug.qtpl:168
+			qw422016.N().S(` `)
+//line lib/promrelabel/debug.qtpl:168
+			qw422016.N().S(`<a href="`)
+//line lib/promrelabel/debug.qtpl:168
+			qw422016.E().S(targetURL)
+//line lib/promrelabel/debug.qtpl:168
+			qw422016.N().S(`" target="_blank">`)
+//line lib/promrelabel/debug.qtpl:168
+			qw422016.E().S(targetURL)
+//line lib/promrelabel/debug.qtpl:168
+			qw422016.N().S(`</a>`)
+//line lib/promrelabel/debug.qtpl:169
+			if targetID != "" {
+//line lib/promrelabel/debug.qtpl:170
+				qw422016.N().S(` `)
+//line lib/promrelabel/debug.qtpl:170
+				qw422016.N().S(`(<a href="target_response?id=`)
+//line lib/promrelabel/debug.qtpl:171
+				qw422016.E().S(targetID)
+//line lib/promrelabel/debug.qtpl:171
+				qw422016.N().S(`" target="_blank" title="click to fetch target response on behalf of the scraper">response</a>)`)
+//line lib/promrelabel/debug.qtpl:172
+			}
+//line lib/promrelabel/debug.qtpl:172
+			qw422016.N().S(`</div>`)
+//line lib/promrelabel/debug.qtpl:174
+		}
+//line lib/promrelabel/debug.qtpl:174
+		qw422016.N().S(`</div>`)
+//line lib/promrelabel/debug.qtpl:176
+	}
+//line lib/promrelabel/debug.qtpl:177
+}
+
+//line lib/promrelabel/debug.qtpl:177
+func writerelabelDebugSteps(qq422016 qtio422016.Writer, dss []DebugStep, targetURL, targetID string) {
+//line lib/promrelabel/debug.qtpl:177
+	qw422016 := qt422016.AcquireWriter(qq422016)
+//line lib/promrelabel/debug.qtpl:177
+	streamrelabelDebugSteps(qw422016, dss, targetURL, targetID)
+//line lib/promrelabel/debug.qtpl:177
+	qt422016.ReleaseWriter(qw422016)
+//line lib/promrelabel/debug.qtpl:177
+}
+
+//line lib/promrelabel/debug.qtpl:177
+func relabelDebugSteps(dss []DebugStep, targetURL, targetID string) string {
+//line lib/promrelabel/debug.qtpl:177
+	qb422016 := qt422016.AcquireByteBuffer()
+//line lib/promrelabel/debug.qtpl:177
+	writerelabelDebugSteps(qb422016, dss, targetURL, targetID)
+//line lib/promrelabel/debug.qtpl:177
+	qs422016 := string(qb422016.B)
+//line lib/promrelabel/debug.qtpl:177
+	qt422016.ReleaseByteBuffer(qb422016)
+//line lib/promrelabel/debug.qtpl:177
+	return qs422016
+//line lib/promrelabel/debug.qtpl:177
+}
+
+//line lib/promrelabel/debug.qtpl:179
+func StreamRelabelDebugStepsJSON(qw422016 *qt422016.Writer, targetURL, targetID string, dss []DebugStep, metric, relabelConfigs, rwRelabelConfigs string, urlRelabelIndexLength, urlRelabelIndexCurrent int, isTargetRelabel bool, err error) {
+//line lib/promrelabel/debug.qtpl:179
+	qw422016.N().S(`{`)
+//line lib/promrelabel/debug.qtpl:181
+	if err != nil {
+//line lib/promrelabel/debug.qtpl:181
+		qw422016.N().S(`"status": "error","error":`)
+//line lib/promrelabel/debug.qtpl:183
+		qw422016.N().Q(fmt.Sprintf("Error: %s", err))
+//line lib/promrelabel/debug.qtpl:184
+	} else {
+//line lib/promrelabel/debug.qtpl:185
 		var hasError bool
 
-//line lib/promrelabel/debug.qtpl:160
+//line lib/promrelabel/debug.qtpl:185
 		qw422016.N().S(`"status": "success","steps": [`)
-//line lib/promrelabel/debug.qtpl:163
+//line lib/promrelabel/debug.qtpl:188
 		for i, ds := range dss {
-//line lib/promrelabel/debug.qtpl:165
+//line lib/promrelabel/debug.qtpl:190
 			inLabels, inErr := promutil.NewLabelsFromString(ds.In)
 			outLabels, outErr := promutil.NewLabelsFromString(ds.Out)
 			changedLabels := getChangedLabelNames(inLabels, outLabels)
 
-//line lib/promrelabel/debug.qtpl:168
+//line lib/promrelabel/debug.qtpl:193
 			qw422016.N().S(`{"inLabels":`)
-//line lib/promrelabel/debug.qtpl:170
+//line lib/promrelabel/debug.qtpl:195
 			qw422016.N().Q(labelsWithHighlight(inLabels, changedLabels, "#D15757"))
-//line lib/promrelabel/debug.qtpl:170
+//line lib/promrelabel/debug.qtpl:195
 			qw422016.N().S(`,"outLabels":`)
-//line lib/promrelabel/debug.qtpl:171
+//line lib/promrelabel/debug.qtpl:196
 			qw422016.N().Q(labelsWithHighlight(outLabels, changedLabels, "#4495e0"))
-//line lib/promrelabel/debug.qtpl:171
+//line lib/promrelabel/debug.qtpl:196
 			qw422016.N().S(`,"rule":`)
-//line lib/promrelabel/debug.qtpl:172
-			qw422016.N().Q(ds.Rule)
-//line lib/promrelabel/debug.qtpl:172
-			qw422016.N().S(`,"errors": {`)
-//line lib/promrelabel/debug.qtpl:174
-			if inErr != nil {
-//line lib/promrelabel/debug.qtpl:174
-				qw422016.N().S(`"inLabels":`)
-//line lib/promrelabel/debug.qtpl:175
-				qw422016.N().Q(`<span style="color: #D15757">` + inErr.Error() + `</span>`)
-//line lib/promrelabel/debug.qtpl:175
-				if outErr != nil {
-//line lib/promrelabel/debug.qtpl:175
-					qw422016.N().S(`,`)
-//line lib/promrelabel/debug.qtpl:175
-				}
-//line lib/promrelabel/debug.qtpl:176
-				hasError = true
-
-//line lib/promrelabel/debug.qtpl:177
-			} else {
-//line lib/promrelabel/debug.qtpl:178
-			}
-//line lib/promrelabel/debug.qtpl:179
-			if outErr != nil {
-//line lib/promrelabel/debug.qtpl:179
-				qw422016.N().S(`"outLabels":`)
-//line lib/promrelabel/debug.qtpl:180
-				qw422016.N().Q(`<span style="color: #D15757">` + outErr.Error() + `</span>`)
-//line lib/promrelabel/debug.qtpl:181
-				hasError = true
-
-//line lib/promrelabel/debug.qtpl:182
-			}
-//line lib/promrelabel/debug.qtpl:182
-			qw422016.N().S(`}}`)
-//line lib/promrelabel/debug.qtpl:185
-			if i != len(dss)-1 {
-//line lib/promrelabel/debug.qtpl:185
-				qw422016.N().S(`,`)
-//line lib/promrelabel/debug.qtpl:185
-			}
-//line lib/promrelabel/debug.qtpl:186
-		}
-//line lib/promrelabel/debug.qtpl:186
-		qw422016.N().S(`]`)
-//line lib/promrelabel/debug.qtpl:188
-		if len(dss) > 0 && !hasError {
-//line lib/promrelabel/debug.qtpl:188
-			qw422016.N().S(`,"originalLabels":`)
-//line lib/promrelabel/debug.qtpl:190
-			qw422016.N().Q(mustFormatLabels(dss[0].In))
-//line lib/promrelabel/debug.qtpl:190
-			qw422016.N().S(`,"resultingLabels":`)
-//line lib/promrelabel/debug.qtpl:191
-			qw422016.N().Q(mustFormatLabels(dss[len(dss)-1].Out))
-//line lib/promrelabel/debug.qtpl:192
-		}
-//line lib/promrelabel/debug.qtpl:193
-	}
-//line lib/promrelabel/debug.qtpl:193
-	qw422016.N().S(`}`)
-//line lib/promrelabel/debug.qtpl:195
-}
-
-//line lib/promrelabel/debug.qtpl:195
-func WriteRelabelDebugStepsJSON(qq422016 qtio422016.Writer, targetURL, targetID string, dss []DebugStep, metric, relabelConfigs string, err error) {
-//line lib/promrelabel/debug.qtpl:195
-	qw422016 := qt422016.AcquireWriter(qq422016)
-//line lib/promrelabel/debug.qtpl:195
-	StreamRelabelDebugStepsJSON(qw422016, targetURL, targetID, dss, metric, relabelConfigs, err)
-//line lib/promrelabel/debug.qtpl:195
-	qt422016.ReleaseWriter(qw422016)
-//line lib/promrelabel/debug.qtpl:195
-}
-
-//line lib/promrelabel/debug.qtpl:195
-func RelabelDebugStepsJSON(targetURL, targetID string, dss []DebugStep, metric, relabelConfigs string, err error) string {
-//line lib/promrelabel/debug.qtpl:195
-	qb422016 := qt422016.AcquireByteBuffer()
-//line lib/promrelabel/debug.qtpl:195
-	WriteRelabelDebugStepsJSON(qb422016, targetURL, targetID, dss, metric, relabelConfigs, err)
-//line lib/promrelabel/debug.qtpl:195
-	qs422016 := string(qb422016.B)
-//line lib/promrelabel/debug.qtpl:195
-	qt422016.ReleaseByteBuffer(qb422016)
-//line lib/promrelabel/debug.qtpl:195
-	return qs422016
-//line lib/promrelabel/debug.qtpl:195
-}
-
 //line lib/promrelabel/debug.qtpl:197
-func streamlabelsWithHighlight(qw422016 *qt422016.Writer, labels *promutil.Labels, highlight map[string]struct{}, color string) {
+			qw422016.N().Q(ds.Rule)
+//line lib/promrelabel/debug.qtpl:197
+			qw422016.N().S(`,"errors": {`)
 //line lib/promrelabel/debug.qtpl:199
+			if inErr != nil {
+//line lib/promrelabel/debug.qtpl:199
+				qw422016.N().S(`"inLabels":`)
+//line lib/promrelabel/debug.qtpl:200
+				qw422016.N().Q(`<span style="color: #D15757">` + inErr.Error() + `</span>`)
+//line lib/promrelabel/debug.qtpl:200
+				if outErr != nil {
+//line lib/promrelabel/debug.qtpl:200
+					qw422016.N().S(`,`)
+//line lib/promrelabel/debug.qtpl:200
+				}
+//line lib/promrelabel/debug.qtpl:201
+				hasError = true
+
+//line lib/promrelabel/debug.qtpl:202
+			} else {
+//line lib/promrelabel/debug.qtpl:203
+			}
+//line lib/promrelabel/debug.qtpl:204
+			if outErr != nil {
+//line lib/promrelabel/debug.qtpl:204
+				qw422016.N().S(`"outLabels":`)
+//line lib/promrelabel/debug.qtpl:205
+				qw422016.N().Q(`<span style="color: #D15757">` + outErr.Error() + `</span>`)
+//line lib/promrelabel/debug.qtpl:206
+				hasError = true
+
+//line lib/promrelabel/debug.qtpl:207
+			}
+//line lib/promrelabel/debug.qtpl:207
+			qw422016.N().S(`}}`)
+//line lib/promrelabel/debug.qtpl:210
+			if i != len(dss)-1 {
+//line lib/promrelabel/debug.qtpl:210
+				qw422016.N().S(`,`)
+//line lib/promrelabel/debug.qtpl:210
+			}
+//line lib/promrelabel/debug.qtpl:211
+		}
+//line lib/promrelabel/debug.qtpl:211
+		qw422016.N().S(`]`)
+//line lib/promrelabel/debug.qtpl:213
+		if len(dss) > 0 && !hasError {
+//line lib/promrelabel/debug.qtpl:213
+			qw422016.N().S(`,"originalLabels":`)
+//line lib/promrelabel/debug.qtpl:215
+			qw422016.N().Q(mustFormatLabels(dss[0].In))
+//line lib/promrelabel/debug.qtpl:215
+			qw422016.N().S(`,"resultingLabels":`)
+//line lib/promrelabel/debug.qtpl:216
+			qw422016.N().Q(mustFormatLabels(dss[len(dss)-1].Out))
+//line lib/promrelabel/debug.qtpl:217
+		}
+//line lib/promrelabel/debug.qtpl:218
+	}
+//line lib/promrelabel/debug.qtpl:218
+	qw422016.N().S(`}`)
+//line lib/promrelabel/debug.qtpl:220
+}
+
+//line lib/promrelabel/debug.qtpl:220
+func WriteRelabelDebugStepsJSON(qq422016 qtio422016.Writer, targetURL, targetID string, dss []DebugStep, metric, relabelConfigs, rwRelabelConfigs string, urlRelabelIndexLength, urlRelabelIndexCurrent int, isTargetRelabel bool, err error) {
+//line lib/promrelabel/debug.qtpl:220
+	qw422016 := qt422016.AcquireWriter(qq422016)
+//line lib/promrelabel/debug.qtpl:220
+	StreamRelabelDebugStepsJSON(qw422016, targetURL, targetID, dss, metric, relabelConfigs, rwRelabelConfigs, urlRelabelIndexLength, urlRelabelIndexCurrent, isTargetRelabel, err)
+//line lib/promrelabel/debug.qtpl:220
+	qt422016.ReleaseWriter(qw422016)
+//line lib/promrelabel/debug.qtpl:220
+}
+
+//line lib/promrelabel/debug.qtpl:220
+func RelabelDebugStepsJSON(targetURL, targetID string, dss []DebugStep, metric, relabelConfigs, rwRelabelConfigs string, urlRelabelIndexLength, urlRelabelIndexCurrent int, isTargetRelabel bool, err error) string {
+//line lib/promrelabel/debug.qtpl:220
+	qb422016 := qt422016.AcquireByteBuffer()
+//line lib/promrelabel/debug.qtpl:220
+	WriteRelabelDebugStepsJSON(qb422016, targetURL, targetID, dss, metric, relabelConfigs, rwRelabelConfigs, urlRelabelIndexLength, urlRelabelIndexCurrent, isTargetRelabel, err)
+//line lib/promrelabel/debug.qtpl:220
+	qs422016 := string(qb422016.B)
+//line lib/promrelabel/debug.qtpl:220
+	qt422016.ReleaseByteBuffer(qb422016)
+//line lib/promrelabel/debug.qtpl:220
+	return qs422016
+//line lib/promrelabel/debug.qtpl:220
+}
+
+//line lib/promrelabel/debug.qtpl:222
+func streamlabelsWithHighlight(qw422016 *qt422016.Writer, labels *promutil.Labels, highlight map[string]struct{}, color string) {
+//line lib/promrelabel/debug.qtpl:224
 	labelsList := labels.GetLabels()
 	metricName := ""
 	for i, label := range labelsList {
@@ -509,153 +561,153 @@ func streamlabelsWithHighlight(qw422016 *qt422016.Writer, labels *promutil.Label
 		}
 	}
 
-//line lib/promrelabel/debug.qtpl:209
+//line lib/promrelabel/debug.qtpl:234
 	if metricName != "" {
-//line lib/promrelabel/debug.qtpl:210
+//line lib/promrelabel/debug.qtpl:235
 		if _, ok := highlight["__name__"]; ok {
-//line lib/promrelabel/debug.qtpl:210
+//line lib/promrelabel/debug.qtpl:235
 			qw422016.N().S(`<span style="font-weight:bold;color:`)
-//line lib/promrelabel/debug.qtpl:211
+//line lib/promrelabel/debug.qtpl:236
 			qw422016.E().S(color)
-//line lib/promrelabel/debug.qtpl:211
+//line lib/promrelabel/debug.qtpl:236
 			qw422016.N().S(`">`)
-//line lib/promrelabel/debug.qtpl:211
+//line lib/promrelabel/debug.qtpl:236
 			qw422016.E().S(metricName)
-//line lib/promrelabel/debug.qtpl:211
+//line lib/promrelabel/debug.qtpl:236
 			qw422016.N().S(`</span>`)
-//line lib/promrelabel/debug.qtpl:212
+//line lib/promrelabel/debug.qtpl:237
 		} else {
-//line lib/promrelabel/debug.qtpl:213
+//line lib/promrelabel/debug.qtpl:238
 			qw422016.E().S(metricName)
-//line lib/promrelabel/debug.qtpl:214
+//line lib/promrelabel/debug.qtpl:239
 		}
-//line lib/promrelabel/debug.qtpl:215
+//line lib/promrelabel/debug.qtpl:240
 		if len(labelsList) == 0 {
-//line lib/promrelabel/debug.qtpl:215
+//line lib/promrelabel/debug.qtpl:240
 			return
-//line lib/promrelabel/debug.qtpl:215
+//line lib/promrelabel/debug.qtpl:240
 		}
-//line lib/promrelabel/debug.qtpl:216
+//line lib/promrelabel/debug.qtpl:241
 	}
-//line lib/promrelabel/debug.qtpl:216
+//line lib/promrelabel/debug.qtpl:241
 	qw422016.N().S(`{`)
-//line lib/promrelabel/debug.qtpl:218
+//line lib/promrelabel/debug.qtpl:243
 	for i, label := range labelsList {
-//line lib/promrelabel/debug.qtpl:219
+//line lib/promrelabel/debug.qtpl:244
 		if _, ok := highlight[label.Name]; ok {
-//line lib/promrelabel/debug.qtpl:219
+//line lib/promrelabel/debug.qtpl:244
 			qw422016.N().S(`<span style="font-weight:bold;color:`)
-//line lib/promrelabel/debug.qtpl:220
+//line lib/promrelabel/debug.qtpl:245
 			qw422016.E().S(color)
-//line lib/promrelabel/debug.qtpl:220
+//line lib/promrelabel/debug.qtpl:245
 			qw422016.N().S(`">`)
-//line lib/promrelabel/debug.qtpl:220
+//line lib/promrelabel/debug.qtpl:245
 			qw422016.E().S(label.Name)
-//line lib/promrelabel/debug.qtpl:220
+//line lib/promrelabel/debug.qtpl:245
 			qw422016.N().S(`=`)
-//line lib/promrelabel/debug.qtpl:220
+//line lib/promrelabel/debug.qtpl:245
 			qw422016.E().Q(label.Value)
-//line lib/promrelabel/debug.qtpl:220
+//line lib/promrelabel/debug.qtpl:245
 			qw422016.N().S(`</span>`)
-//line lib/promrelabel/debug.qtpl:221
+//line lib/promrelabel/debug.qtpl:246
 		} else {
-//line lib/promrelabel/debug.qtpl:222
+//line lib/promrelabel/debug.qtpl:247
 			qw422016.E().S(label.Name)
-//line lib/promrelabel/debug.qtpl:222
+//line lib/promrelabel/debug.qtpl:247
 			qw422016.N().S(`=`)
-//line lib/promrelabel/debug.qtpl:222
+//line lib/promrelabel/debug.qtpl:247
 			qw422016.E().Q(label.Value)
-//line lib/promrelabel/debug.qtpl:223
+//line lib/promrelabel/debug.qtpl:248
 		}
-//line lib/promrelabel/debug.qtpl:224
+//line lib/promrelabel/debug.qtpl:249
 		if i < len(labelsList)-1 {
-//line lib/promrelabel/debug.qtpl:224
+//line lib/promrelabel/debug.qtpl:249
 			qw422016.N().S(`,`)
-//line lib/promrelabel/debug.qtpl:224
+//line lib/promrelabel/debug.qtpl:249
 			qw422016.N().S(` `)
-//line lib/promrelabel/debug.qtpl:224
+//line lib/promrelabel/debug.qtpl:249
 		}
-//line lib/promrelabel/debug.qtpl:225
+//line lib/promrelabel/debug.qtpl:250
 	}
-//line lib/promrelabel/debug.qtpl:225
+//line lib/promrelabel/debug.qtpl:250
 	qw422016.N().S(`}`)
-//line lib/promrelabel/debug.qtpl:227
+//line lib/promrelabel/debug.qtpl:252
 }
 
-//line lib/promrelabel/debug.qtpl:227
+//line lib/promrelabel/debug.qtpl:252
 func writelabelsWithHighlight(qq422016 qtio422016.Writer, labels *promutil.Labels, highlight map[string]struct{}, color string) {
-//line lib/promrelabel/debug.qtpl:227
+//line lib/promrelabel/debug.qtpl:252
 	qw422016 := qt422016.AcquireWriter(qq422016)
-//line lib/promrelabel/debug.qtpl:227
+//line lib/promrelabel/debug.qtpl:252
 	streamlabelsWithHighlight(qw422016, labels, highlight, color)
-//line lib/promrelabel/debug.qtpl:227
+//line lib/promrelabel/debug.qtpl:252
 	qt422016.ReleaseWriter(qw422016)
-//line lib/promrelabel/debug.qtpl:227
+//line lib/promrelabel/debug.qtpl:252
 }
 
-//line lib/promrelabel/debug.qtpl:227
+//line lib/promrelabel/debug.qtpl:252
 func labelsWithHighlight(labels *promutil.Labels, highlight map[string]struct{}, color string) string {
-//line lib/promrelabel/debug.qtpl:227
+//line lib/promrelabel/debug.qtpl:252
 	qb422016 := qt422016.AcquireByteBuffer()
-//line lib/promrelabel/debug.qtpl:227
+//line lib/promrelabel/debug.qtpl:252
 	writelabelsWithHighlight(qb422016, labels, highlight, color)
-//line lib/promrelabel/debug.qtpl:227
+//line lib/promrelabel/debug.qtpl:252
 	qs422016 := string(qb422016.B)
-//line lib/promrelabel/debug.qtpl:227
+//line lib/promrelabel/debug.qtpl:252
 	qt422016.ReleaseByteBuffer(qb422016)
-//line lib/promrelabel/debug.qtpl:227
+//line lib/promrelabel/debug.qtpl:252
 	return qs422016
-//line lib/promrelabel/debug.qtpl:227
+//line lib/promrelabel/debug.qtpl:252
 }
 
-//line lib/promrelabel/debug.qtpl:229
+//line lib/promrelabel/debug.qtpl:254
 func streammustFormatLabels(qw422016 *qt422016.Writer, s string) {
-//line lib/promrelabel/debug.qtpl:230
+//line lib/promrelabel/debug.qtpl:255
 	labels, err := promutil.NewLabelsFromString(s)
 
-//line lib/promrelabel/debug.qtpl:231
+//line lib/promrelabel/debug.qtpl:256
 	if err != nil {
-//line lib/promrelabel/debug.qtpl:231
+//line lib/promrelabel/debug.qtpl:256
 		qw422016.N().S(`<span style="color: red" title="error parsing labels:`)
-//line lib/promrelabel/debug.qtpl:232
+//line lib/promrelabel/debug.qtpl:257
 		qw422016.E().S(err.Error())
-//line lib/promrelabel/debug.qtpl:232
+//line lib/promrelabel/debug.qtpl:257
 		qw422016.N().S(`">`)
-//line lib/promrelabel/debug.qtpl:232
+//line lib/promrelabel/debug.qtpl:257
 		qw422016.E().S("error parsing labels: " + err.Error())
-//line lib/promrelabel/debug.qtpl:232
+//line lib/promrelabel/debug.qtpl:257
 		qw422016.N().S(`</span>`)
-//line lib/promrelabel/debug.qtpl:233
+//line lib/promrelabel/debug.qtpl:258
 	} else {
-//line lib/promrelabel/debug.qtpl:234
+//line lib/promrelabel/debug.qtpl:259
 		streamlabelsWithHighlight(qw422016, labels, nil, "")
-//line lib/promrelabel/debug.qtpl:235
+//line lib/promrelabel/debug.qtpl:260
 	}
-//line lib/promrelabel/debug.qtpl:236
+//line lib/promrelabel/debug.qtpl:261
 }
 
-//line lib/promrelabel/debug.qtpl:236
+//line lib/promrelabel/debug.qtpl:261
 func writemustFormatLabels(qq422016 qtio422016.Writer, s string) {
-//line lib/promrelabel/debug.qtpl:236
+//line lib/promrelabel/debug.qtpl:261
 	qw422016 := qt422016.AcquireWriter(qq422016)
-//line lib/promrelabel/debug.qtpl:236
+//line lib/promrelabel/debug.qtpl:261
 	streammustFormatLabels(qw422016, s)
-//line lib/promrelabel/debug.qtpl:236
+//line lib/promrelabel/debug.qtpl:261
 	qt422016.ReleaseWriter(qw422016)
-//line lib/promrelabel/debug.qtpl:236
+//line lib/promrelabel/debug.qtpl:261
 }
 
-//line lib/promrelabel/debug.qtpl:236
+//line lib/promrelabel/debug.qtpl:261
 func mustFormatLabels(s string) string {
-//line lib/promrelabel/debug.qtpl:236
+//line lib/promrelabel/debug.qtpl:261
 	qb422016 := qt422016.AcquireByteBuffer()
-//line lib/promrelabel/debug.qtpl:236
+//line lib/promrelabel/debug.qtpl:261
 	writemustFormatLabels(qb422016, s)
-//line lib/promrelabel/debug.qtpl:236
+//line lib/promrelabel/debug.qtpl:261
 	qs422016 := string(qb422016.B)
-//line lib/promrelabel/debug.qtpl:236
+//line lib/promrelabel/debug.qtpl:261
 	qt422016.ReleaseByteBuffer(qb422016)
-//line lib/promrelabel/debug.qtpl:236
+//line lib/promrelabel/debug.qtpl:261
 	return qs422016
-//line lib/promrelabel/debug.qtpl:236
+//line lib/promrelabel/debug.qtpl:261
 }

lib/promrelabel/debug_test.go

@@ -10,10 +10,10 @@ import (
 
 // TestWriteRelabelDebugSupportFormats verifies the relabeling debug input, rules and output.
 func TestWriteRelabelDebugSupportFormats(t *testing.T) {
-	f := func(input, rule, expect string) {
+	f := func(input, relabelRules, globalRemoteWriteRelabelRules, urlRelabelRules, expect string) {
 		// execute
 		outputWriter := bytes.NewBuffer(nil)
-		writeRelabelDebug(outputWriter, false, "", input, rule, "json", nil)
+		writeRelabelDebug(outputWriter, false, "", input, relabelRules, globalRemoteWriteRelabelRules+urlRelabelRules, 0, 0, "json", nil)
 
 		// the response is in JSON with HTML content, extract the `resultingLabels` in JSON and unescape it.
 		resultingLabels := fastjson.GetString(outputWriter.Bytes(), `resultingLabels`)
@@ -31,14 +31,30 @@ func TestWriteRelabelDebugSupportFormats(t *testing.T) {
 - action: labeldrop
   regex: "a_not_exist_label"
 `
-	f(`metric_name`, ruleTestParsing, `metric_name`)
-	f(`metric_name{label1="value1"}`, ruleTestParsing, `metric_name{label1="value1"}`)
-	f(`{__name__="metric_name", label1="value1"}`, ruleTestParsing, `metric_name{label1="value1"}`)
-	f(`__name__="metric_name", label1="value1"`, ruleTestParsing, `metric_name{label1="value1"}`)
-	f(`_name__="metric_name"`, ruleTestParsing, `{_name__="metric_name"}`)
+	f(`metric_name`, ruleTestParsing, "", "", `metric_name`)
+	f(`metric_name{label1="value1"}`, ruleTestParsing, "", "", `metric_name{label1="value1"}`)
+	f(`{__name__="metric_name", label1="value1"}`, ruleTestParsing, "", "", `metric_name{label1="value1"}`)
+	f(`__name__="metric_name", label1="value1"`, ruleTestParsing, "", "", `metric_name{label1="value1"}`)
+	f(`_name__="metric_name"`, ruleTestParsing, "", "", `{_name__="metric_name"}`)
 
 	// special case: incorrect input format
-	f(`{_name__="metric_name"`, ruleTestParsing, ``)
-	f(`_name__="metric_name}"`, ruleTestParsing, ``)
-	f(`metrics_name}"`, ruleTestParsing, ``)
+	f(`{_name__="metric_name"`, ruleTestParsing, "", "", ``)
+	f(`_name__="metric_name}"`, ruleTestParsing, "", "", ``)
+	f(`metrics_name}"`, ruleTestParsing, "", "", ``)
+
+	// test multiple rules including remote writes
+	// drop all labels and add one in URL relabeling
+	rule1 := `
+- action: labeldrop
+  regex: "drop_me_metrics_relabel"
+`
+	rule2 := `
+- action: labeldrop
+  regex: "drop_me_remote_write_relabel"
+`
+	rule3 := `
+- target_label: add_me_url_relabel
+  replacement: added
+`
+	f(`{__name__="metric_name", drop_me_metrics_relabel="1", drop_me_remote_write_relabel="2"}`, rule1, rule2, rule3, `metric_name{add_me_url_relabel="added"}`)
 }

lib/promscrape/relabel_debug.go

@@ -3,34 +3,96 @@ package promscrape
 import (
 	"fmt"
 	"net/http"
+	"strconv"
 
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/httpserver"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promrelabel"
 )
 
-// WriteMetricRelabelDebug serves requests to /metric-relabel-debug page
-func WriteMetricRelabelDebug(w http.ResponseWriter, r *http.Request) {
+// WriteMetricRelabelDebug serves requests to /metric-relabel-debug page.
+// remotewrite-related relabel configs could be empty as vmsingle doesn't provide remote write feature.
+func WriteMetricRelabelDebug(w http.ResponseWriter, r *http.Request, rwGlobalRelabelConfigs string, rwURLRelabelConfigss []string) {
 	targetID := r.FormValue("id")
 	metric := r.FormValue("metric")
 	relabelConfigs := r.FormValue("relabel_configs")
+	rwRelabelConfigs := r.FormValue("remote_write_relabel_configs") // global + per-URL configs.
+
+	rwURLRelabelConfigsIdxStr := r.FormValue("url_relabel_configs_index")  // only for per-URL configs and has to be set with reload_url_relabel_configs.
+	reloadRWURLRelabelConfigs := r.FormValue("reload_url_relabel_configs") // if set, it will reset the whole remote_write_relabel_configs.
+
 	format := r.FormValue("format")
 	var err error
 
-	if metric == "" && relabelConfigs == "" && targetID != "" {
+	// if all per-URL config is empty, it means no per-URL rule is configured.
+	// set it to 0 so the user do not see the options in debug page.
+	rwURLRelabelConfigsLength := 0
+	for _, urlRelabelConfig := range rwURLRelabelConfigss {
+		if urlRelabelConfig != "" {
+			rwURLRelabelConfigsLength = len(rwURLRelabelConfigss)
+			break
+		}
+	}
+
+	rwURLRelabelConfigsIdx, idxErr := strconv.Atoi(rwURLRelabelConfigsIdxStr)
+	if idxErr != nil {
+		rwURLRelabelConfigsIdx = -1
+	}
+
+	// if everything is not set, we should load the initial data for user.
+	if metric == "" && relabelConfigs == "" && rwRelabelConfigs == "" && rwURLRelabelConfigsIdxStr == "" && reloadRWURLRelabelConfigs == "" && targetID != "" {
 		pcs, labels, ok := getMetricRelabelContextByTargetID(targetID)
 		if !ok {
 			err = fmt.Errorf("cannot find target for id=%s", targetID)
 			targetID = ""
 		} else {
 			metric = labels.String()
-			relabelConfigs = pcs.String()
+			relabelConfigs += pcs.String()
+
+			// by default use the first per-URL remote write relabel config, if exists.
+			rwURLRelabelConfigs := ""
+			if len(rwURLRelabelConfigss) > 0 {
+				rwURLRelabelConfigs = rwURLRelabelConfigss[0]
+			}
+
+			if rwGlobalRelabelConfigs != "" {
+				rwRelabelConfigs += "\n# -remoteWrite.relabelConfig"
+				rwRelabelConfigs += "\n" + rwGlobalRelabelConfigs
+			}
+			if rwURLRelabelConfigs != "" {
+				rwRelabelConfigs += "\n# -remoteWrite.urlRelabelConfig"
+				rwRelabelConfigs += "\n" + rwURLRelabelConfigs
+			}
 		}
 	}
+
+	// if reloadRWURLRelabelConfigs is set, it means user clicked the button and want to reload the rwRelabelConfigs by rwURLRelabelConfigsIdx
+	if reloadRWURLRelabelConfigs != "" {
+		// set the per-URL remote write relabel according to index, any error will fall back the index to 0.
+		rwURLRelabelConfigs := ""
+		if len(rwURLRelabelConfigss) > 0 {
+			// ignore the error if the input is invalid or exceed the length, and fallback to 0.
+			if rwURLRelabelConfigsIdx < 0 || rwURLRelabelConfigsIdx >= len(rwURLRelabelConfigss) {
+				rwURLRelabelConfigsIdx = 0
+			}
+			rwURLRelabelConfigs = rwURLRelabelConfigss[rwURLRelabelConfigsIdx]
+		}
+
+		// reload will remove the existing content
+		if rwGlobalRelabelConfigs != "" {
+			rwRelabelConfigs = "\n# -remoteWrite.relabelConfig"
+			rwRelabelConfigs += "\n" + rwGlobalRelabelConfigs
+		}
+		if rwURLRelabelConfigs != "" {
+			rwRelabelConfigs += "\n# -remoteWrite.urlRelabelConfig"
+			rwRelabelConfigs += "\n" + rwURLRelabelConfigs
+		}
+	}
+
 	if format == "json" {
 		httpserver.EnableCORS(w, r)
 		w.Header().Set("Content-Type", "application/json")
 	}
-	promrelabel.WriteMetricRelabelDebug(w, targetID, metric, relabelConfigs, format, err)
+	promrelabel.WriteMetricRelabelDebug(w, targetID, metric, relabelConfigs, rwRelabelConfigs, rwURLRelabelConfigsLength, rwURLRelabelConfigsIdx, format, err)
 }
 
 // WriteTargetRelabelDebug generates response for /target-relabel-debug page