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This PR exposes a new metric `vmalert_rule_group_results_limit` to track the effective results limit applied to a given rule group.
Currently, `vmalert` allows bounding the number of series returned by
evaluating a rule either globally (`-rule.resultsLimit`) or per group
(`groups[].limit`). However, the effective limit applied isn't easily
observable as a metric, which makes it difficult to natively construct
alerts for rules that are dropping output due to exceeding this limit.
By exposing `vmalert_rule_group_results_limit{group="...", file="..."}`,
users can seamlessly compare actual evaluation outputs against the
configured bounds natively using Prometheus/VictoriaMetrics, without
needing out-of-band workarounds.
**Changes:**
- Registers the `vmalert_rule_group_results_limit` gauge during group
initialization.
- Adds tests verifying limits correctly resolve from both global
fallbacks and per-group overrides.
Fixes https://github.com/VictoriaMetrics/VictoriaMetrics/issues/11179
PR https://github.com/VictoriaMetrics/VictoriaMetrics/pull/11182
---------
Signed-off-by: Vinyas Bharadwaj <vinyasbharadwaj101@gmail.com>
Signed-off-by: vinyas-bharadwaj <vinyasbharadwaj101@gmail.com>
Co-authored-by: Max Kotliar <mkotlyar@victoriametrics.com>