Loki integration

[luissimas]

Description

Loki is a solution for ingesting and querying logs. Incus provides a native integration with Loki that can be configured. The integration can be set up by collecting all Loki push endpoints and then configuring them in Incus. With that set up, Incus will start pushing logs and events to Loki.

Definition of done

• The charm has an optional requires relation with the interface loki_push_api
• When the relation is present, the Loki endpoints are configured on Incus
• When the relation is removed, the Loki endpoints are removed from Incus's configuration
• The charm exposes config option to configure the loki.loglevel and loki.types settings on Incus

Resources

https://charmhub.io/loki-k8s
https://charmhub.io/loki-k8s/libraries/loki_push_api
https://linuxcontainers.org/incus/docs/main/server_config/#server-options-loki