Enable Vault Prometheus

[ashu3103]

Enable Prometheus in vault

About this commit

• Bind an HTTP server in pgagroal-vault at port metrics in configuration to track server activities
• Added some fields like - metrics, hugepage, metric_cache_max_age and metric_cache_max_size in the common configuration
• Added an additional check is_prometheus_enabled on all the prometheus functions and code blocks which basically checks whether the metrics port is active or not.
• Based on the metric port value we allocate memory to prometheus structure and prometheus_cache

Future work

• Segregate the prometheus structure for main and vault similar to configuration for optimal memory management.
• prometheus should be initiated only when metric port is active --> Document it properly somewhere.

@jesperpedersen @fluca1978 PTAL.

[jesperpedersen]

Remember the tutorial, man page and manual as well

[ashu3103]

Remember the tutorial, man page and manual as well

Yeah working on it parallely

[jesperpedersen]

Maybe enable metrics by default in the pgagroal_vault.conf as well

[jesperpedersen]

I think that your "Future" section should be easy as well

[jesperpedersen]

prometheus should be initiated only when metric port is active --> Document it properly somewhere.

It is documented in the configuration files - users doesn't need to know about the internals

[ashu3103]

prometheus should be initiated only when metric port is active --> Document it properly somewhere.

It is documented in the configuration files - users doesn't need to know about the internals

Yeah, but for new developers it might be required

[jesperpedersen]

You can put it in

• https://github.com/agroal/pgagroal/blob/master/doc/ARCHITECTURE.md
• https://github.com/agroal/pgagroal/blob/master/doc/manual/dev-02-architecture.md

[ashu3103]

@jesperpedersen The suggested changes have been integrated PTAL.

[jesperpedersen]

I think it looks good but prometheus_common or prometheus_base is probably better as a name

[jesperpedersen]

Merged.

Thanks for your contribution !