Vault: Add a 'sealed-status' gauge to telemetry

[TimJones]

Feature Request:
Add a telemetry option to report current sealed status of the Vault instance.

I am running a Vault HA deployment in Kubernetes. Using a statsd_exporter side-car to collect metrics from each instance and expose them to Prometheus for monitoring.

With the vault.core.seal and vault.core.unseal metrics, I can perform calculations to get the vault status, until a vault instance restarts (since this is a 'seal' operation without a metric).

A new telemetry point that can just give the current sealedunsealed status as a gauge at vault.core.unsealed_status can be 0 when sealed (set at start-up and with any seal operation) and 1 after a successful unseal operation.

[TimJones]

Or thinking about it another way, maybe on start-up a vault instance should emit the telemetry for seal operations and unseal operations at 0...

[seanjfellows]

+1 to this, related having a leadership status gauge would be similarly useful. Today I don't see a way to determine if the vault cluster has exactly 1 leader.

[richard-mauri]

+1 on adding sealed and leader info added to vault telemetry

[anthosz]

+1

[jayshah11]

+1
What is the ETA?