metric_not_found

Summary

metric `{0}` not found

Help

metric will appear after the producing collector runs at least once

Details

When this fires

Runtime, from EngineResolver in crates/nanook-engine/src/resolver.rs while evaluating a rule expression. Either no metric with that name has ever landed in LatestStore, or the label/collector filters in the selector do not match any live series. Surfaced through engine logs and rule eval errors, not via nanook check.

What to check

Wait one collection interval after startup, since the metric only registers after the first successful collect. If you use a label filter like {env="prod"}, confirm the collector actually tags samples with that label. Names are case-sensitive.