identity: add workload certificate expiry metric - #1889
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Adds istio_cert_expiry_seconds, a Gauge that tracks the Unix timestamp at which each workload certificate expires, labeled by identity (SPIFFE URI). The metric is set in the Worker when a certificate fetch succeeds and removed when the identity is forgotten, avoiding stale series for deleted workloads. Signed-off-by: Jose Luis Ojosnegros Manchón <jojosneg@redhat.com>
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ztunnel has no Prometheus metric for workload certificate expiration. Operators
cannot alert on certificates approaching expiry or detect silent renewal failures.
The sidecar equivalent (
istio_agent_cert_expiry_seconds) exists but has nocounterpart in Ambient Mesh.
Add
istio_cert_expiry_seconds, aGaugelabeled byidentity(SPIFFE URI),set to the Unix timestamp when the workload certificate expires. The metric is
set in
Workerwhen a certificate fetch succeeds and removed when the identityis forgotten, avoiding stale series for deleted workloads.
The value is an absolute Unix timestamp rather than seconds-remaining so it stays
correct across Prometheus scrapes without requiring a renewal cycle to refresh it.
Operators compute time-to-expiry in PromQL:
src/identity/metrics.rsMetricsstruct with the expiry gaugesrc/identity.rspub mod metricssrc/identity/manager.rsWorker; set on fetch, remove on forgetsrc/app.rsREADME.mdSolves: #1748