Add log when firing hook

[David Britton]

When firing a hook, a simple info message of:

    Firing Hook: config-changed

Would be much appreciated.

[Ian Booth (wallyworld)]

This feature is coming in Juju 1.24 - but the logging is done at debug level rather than info.

Whenever the agent or workload status changes, log entries like so are created:

 DEBUG juju.worker.uniter.context context.go:230 [AGENT-STATUS] executing running install hook
 DEBUG juju.worker.uniter.context context.go:230 [WORKLOAD-STATUS] maintenance installing charm software

The log messages are of the form <status> <message>

I think we should add a ":" between the status and message to aide readability.

[AGENT-STATUS] executing: running install hook

Note that "executing" for agent status will also show running actions and juju-run scripts etc, not just hooks.

Did you want this logged at info rather than debug?

[Ian Booth (wallyworld)]

As discussed on IRC, we'll stick with debug for now.

juju status-history is a great way to see the key information for a unit without having to trawl log files

Marking as invalid because the requested functionality is done already in 1.24