METRICS_OVERFLOW_LABEL_VALUE
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constMETRICS_OVERFLOW_LABEL_VALUE:"__overflow__"='__overflow__'
Defined in: src/metrics/Metrics.ts:417
Label value every dimension of an overflow series carries, e.g.
actor_mailbox_dropped_total{path="__overflow__",reason="__overflow__"}.
A value, deliberately, not a label name: Prometheus reserves label
names beginning with __ for its own use and drops them after
relabeling, so an __overflow__="1" name would vanish on ingestion
and collapse the overflow series onto a real one. Label values are
unrestricted, so the marker survives the scrape and stays greppable in
an alert rule ({path="__overflow__"}).