feat(prometheus): expose controlplane connectivity state as a gauge #14020
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cherry-pick kong-ee
Add a new Prometheus gauge metric `control_plane_reachable`. Similar to `datastore_reachable` gauge, 0 means the connection is not healthy; 1 means that the connection is healthy. We mark the connection as unhealthy under the following circumstances: * Failure while establihing a websocket connection * Failure while sending basic information to controlplane * Failure while sending ping to controlplane * Failure while receiving a packet from the websocket connection This is helpful for users running a signficant number of gateways to be alerted about potential issues any gateway(s) may be facing while talking to the controlplane. Signed-off-by: Sanskar Jaiswal <sanskar.jaiswal@konghq.com>
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Summary
Add a new Prometheus gauge metric
controlplane_reachable. Similar todatastore_reachablegauge, 0 means the connection is not healthy; 1 means that the connection is healthy. We mark the connection as unhealthy under the following circumstances:This is helpful for users running a signficant number of gateways to be alerted about potential issues any gateway(s) may be facing while talking to the controlplane.
Checklist
changelog/unreleased/kongorskip-changeloglabel added on PR if changelog is unnecessary. README.mdIssue reference
Fix #[issue number]