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Automatic merge from submit-queue Use Prometheus instrumentation conventions The `System` and `Subsystem` parameters are subject to removal. (x-ref: https://github.com/prometheus/client_golang/issues/240) All metrics should use base units, which is seconds in the duration case. Counters should always end in `_total` and metrics should avoid referring to potential label dimensions. Those should rather be mentioned in the documentation string. @kubernetes/sig-instrumentation Reference docs: https://prometheus.io/docs/practices/instrumentation/ https://prometheus.io/docs/practices/naming/ **Release note**: ``` Breaking change: Renamed REST client Prometheus metrics to follow the instrumentation conventions ("request_latency_microseconds" -> "rest_client_request_latency_seconds", "request_status_codes" -> "rest_client_requests_total"). Please update your alerting pipeline if you rely on them. ```