Add internal_metric gauge whether last config has been loaded successfully or not

[nmiculinic]

A note for the community

For proper vector observability I need to know has the last config been successfully applied or not. Current exposed metrics are insufficient and make it difficult to asses whether vector is running on latest config, or has there been a failure.

Use Cases

No response

Attempted Solutions

Prometheus rule:

vector_reload_errors_total - (vector_reloaded_total or (0 * vector_reload_errors_total)) > 0

is kinda a hack, to get this information. But this fails in case vector was reloaded multiple times successfully in the past. I'm not sure how to get this information properly for alerting purposes

Proposal

Add gauge metric:

vector_valid_config

which will be 1 if the config has been (re)loaded successfully, and 0 if the config cannot be (re)loaded, thus giving something I can alert on in the monitoring system

References

No response

Version

No response