metrics-tag-matching-is-subset

Status: IN

`_matching_keys` performs subset matching: a query with `tags_filter={"a": 1}` matches any series whose tags include `a=1`, regardless of additional tags present

Source: entries/2026/06/05/metrics-monitoring-and-alerting-metrics.md

Depended on by

• metrics-indexing-separates-write-key-from-read-matching

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