Have the last configuration reload time in Status tab

[lparet-yseop]

Hi everyone,

I think it can be usefull for people using Prometheus and AlertManager reload to have the information of the last configuration reload.
In my case, I use reload after pushing a new configuration. So it will be interesting to verify directly in the Prometheus (and AlertManager) UI the last reload. I know we can see the configuration content but if my file has a lot of lines it's difficult to find what I want...

For example:
In Status > Runtime Information for Prometheus
In Status > Status for AlertManager

Let me know what you think about that

[krasi-georgiev]

prometheus provides this via the prometheus_config_last_reload_successful and prometheus_config_last_reload_success_timestamp_seconds metrics
that should work for you?

[brian-brazil]

Already added in #3921

[krasi-georgiev]

Nice!, I missed that one.

[lock]

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