Don't enter blocked status if grafana-agent not related

[samuelallan72]

Currently if grafana-agent is not related the charm will be in blocked status. Possibly this could be confusing. We could consider leaving in active state (perhaps with a message in the status about relating to grafana-agent for dashboards and prometheus scraping).

To discuss.

Pros of staying blocked when no grafana-agent

• save resources while nothing is scraping
• can still shell in and start the snap service manually if you want for testing (I think)

Pros of changing to active when no grafana-agent

• it's confusing if it's blocked (it's not a blocking issue for the exporter technically)
• annoying if you want to manually test the metrics without connecting prometheus/grafana

[aieri]

I think setting blocked is good because it makes the charm self-validating, avoiding the need to write rules for juju-lint or juju-doctor

[samuelallan72]

That's a fair comment. If it makes it easier for operations, then let's keep it as is. :+1:

[aieri]

closing as won't do as we actually like the current behavior :)