receive: Store the most recent config hash and timestamp as metrics #1378
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This PR attempts to store the most recent config md5 checksum, and when it happens as metrics to catch any inconsistencies between current and desired state. The same strategy is used by prometheus/alertmanager#coodinator.
Changes
thanos_receive_config_hash
,thanos_receive_config_last_reload_successful
andthanos_receive_config_last_reload_success_timestamp_seconds
.Verification
make test
,make lint
,make build
and manual verification of the metrics.