diff --git a/app/vmctl/opentsdb.go b/app/vmctl/opentsdb.go
index 6ac4a60503..24161b2215 100644
--- a/app/vmctl/opentsdb.go
+++ b/app/vmctl/opentsdb.go
@@ -132,7 +132,7 @@ func (op *otsdbProcessor) run() error {
 		close(errCh)
 		// check for any lingering errors on the query side
 		for otsdbErr := range errCh {
-			return fmt.Errorf("Import process failed: \n%s", otsdbErr)
+			return fmt.Errorf("import process failed: \n%s", otsdbErr)
 		}
 		bar.Finish()
 		log.Print(op.im.Stats())
diff --git a/app/vmctl/opentsdb/opentsdb.go b/app/vmctl/opentsdb/opentsdb.go
index 11e5caeb59..22f0ab8306 100644
--- a/app/vmctl/opentsdb/opentsdb.go
+++ b/app/vmctl/opentsdb/opentsdb.go
@@ -109,7 +109,7 @@ func (c Client) FindMetrics(q string) ([]string, error) {
 		return nil, fmt.Errorf("failed to send GET request to %q: %s", q, err)
 	}
 	if resp.StatusCode != 200 {
-		return nil, fmt.Errorf("Bad return from OpenTSDB: %q: %v", resp.StatusCode, resp)
+		return nil, fmt.Errorf("bad return from OpenTSDB: %q: %v", resp.StatusCode, resp)
 	}
 	defer func() { _ = resp.Body.Close() }()
 	body, err := io.ReadAll(resp.Body)
@@ -133,7 +133,7 @@ func (c Client) FindSeries(metric string) ([]Meta, error) {
 		return nil, fmt.Errorf("failed to set GET request to %q: %s", q, err)
 	}
 	if resp.StatusCode != 200 {
-		return nil, fmt.Errorf("Bad return from OpenTSDB: %q: %v", resp.StatusCode, resp)
+		return nil, fmt.Errorf("bad return from OpenTSDB: %q: %v", resp.StatusCode, resp)
 	}
 	defer func() { _ = resp.Body.Close() }()
 	body, err := io.ReadAll(resp.Body)
@@ -310,7 +310,7 @@ func NewClient(cfg Config) (*Client, error) {
 	for _, r := range cfg.Retentions {
 		ret, err := convertRetention(r, offsetSecs, cfg.MsecsTime)
 		if err != nil {
-			return &Client{}, fmt.Errorf("Couldn't parse retention %q :: %v", r, err)
+			return &Client{}, fmt.Errorf("couldn't parse retention %q :: %v", r, err)
 		}
 		retentions = append(retentions, ret)
 	}
diff --git a/app/vmselect/graphite/transform.go b/app/vmselect/graphite/transform.go
index d909b503a3..64a5487f08 100644
--- a/app/vmselect/graphite/transform.go
+++ b/app/vmselect/graphite/transform.go
@@ -1380,7 +1380,7 @@ func aggregateSeriesList(ec *evalConfig, fe *graphiteql.FuncExpr, nextSeriesFirs
 	}
 
 	if len(ssFirst) != len(ssSecond) {
-		return nil, fmt.Errorf("First and second lists must have equal number of series; got %d vs %d series", len(ssFirst), len(ssSecond))
+		return nil, fmt.Errorf("first and second lists must have equal number of series; got %d vs %d series", len(ssFirst), len(ssSecond))
 	}
 	if stepFirst != stepSecond {
 		return nil, fmt.Errorf("step mismatch for first and second: %d vs %d", stepFirst, stepSecond)
diff --git a/lib/backup/actions/util.go b/lib/backup/actions/util.go
index 6c71d2a3ff..9136d5ea52 100644
--- a/lib/backup/actions/util.go
+++ b/lib/backup/actions/util.go
@@ -199,7 +199,7 @@ func NewRemoteFS(ctx context.Context, path string) (common.RemoteFS, error) {
 	}
 	n := strings.Index(path, "://")
 	if n < 0 {
-		return nil, fmt.Errorf("Missing scheme in path %q. Supported schemes: `gs://`, `s3://`, `azblob://`, `fs://`", path)
+		return nil, fmt.Errorf("missing scheme in path %q. Supported schemes: `gs://`, `s3://`, `azblob://`, `fs://`", path)
 	}
 	scheme := path[:n]
 	dir := path[n+len("://"):]
diff --git a/lib/protoparser/graphite/stream/streamparser.go b/lib/protoparser/graphite/stream/streamparser.go
index aefd000c6b..fcd23a30df 100644
--- a/lib/protoparser/graphite/stream/streamparser.go
+++ b/lib/protoparser/graphite/stream/streamparser.go
@@ -29,7 +29,7 @@ var (
 func Parse(r io.Reader, encoding string, callback func(rows []graphite.Row) error) error {
 	reader, err := protoparserutil.GetUncompressedReader(r, encoding)
 	if err != nil {
-		return fmt.Errorf("Cannot decode graphite data: %w", err)
+		return fmt.Errorf("cannot decode graphite data: %w", err)
 	}
 	defer protoparserutil.PutUncompressedReader(reader)
 
diff --git a/lib/snapshot/snapshot.go b/lib/snapshot/snapshot.go
index ff00b1b2c0..75533f5315 100644
--- a/lib/snapshot/snapshot.go
+++ b/lib/snapshot/snapshot.go
@@ -73,7 +73,7 @@ func Create(ctx context.Context, createSnapshotURL string) (string, error) {
 	if snap.Status == "error" {
 		return "", errors.New(snap.Msg)
 	}
-	return "", fmt.Errorf("Unknown status: %v", snap.Status)
+	return "", fmt.Errorf("unknown status: %v", snap.Status)
 }
 
 // Delete deletes a snapshot via the provided api endpoint
@@ -121,7 +121,7 @@ func Delete(ctx context.Context, deleteSnapshotURL string, snapshotName string)
 	if snap.Status == "error" {
 		return errors.New(snap.Msg)
 	}
-	return fmt.Errorf("Unknown status: %v", snap.Status)
+	return fmt.Errorf("unknown status: %v", snap.Status)
 }
 
 // GetHTTPClient returns a new HTTP client configured for snapshot operations.