question：has metrics for binding certificates on the gateway?

[beckliln]

Description:

Describe the issue.
In my env，There are some secret bound to the https listener of envoy gateway. Are there any metrics about certificates?
Such as quantity, expiration time, etc.

[optional Relevant Links:]

Any extra documentation required to understand the issue.

[zhaohuabing]

days_until_first_cert_expiring can be very useful as a reminder to rotate the certs.
https://www.envoyproxy.io/docs/envoy/latest/configuration/observability/statistics

There're also some TLS related stattistics on the listener: https://www.envoyproxy.io/docs/envoy/latest/configuration/listeners/stats#tls-statistics

You can follow the Gateway Observability task to retrieve these metrics.

[github-actions]

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