Hi folks,
Just a quick note to let you know about an application and charm I wrote
recently to make it easier to introspect Juju controllers/agents.
$ juju deploy ~axwalk/juju-introspection --to <machine>
$ juju expose juju-introspection
This will deploy https://github.com/axw/juju-introspection-proxy, which
serves the introspection endpoint of each agent on the same machine over
HTTP via the port 19090 (configurable using "port" application config).
For example, say you deploy it to machine 0, and that machine also has the
unit mysql/0. You can access each agent's introspection endpoints via:
http://machine-0-address:19090/agents/machine-0/depengine/
http://machine-0-address:19090/agents/machine-0/debug/pprof/profile
http://machine-0-address:19090/agents/unit-mysql-0/depengine/
You can also hit "/agents", and get a list of agents on the machine.
Juju 2.1 will have Prometheus instrumentation, and you'll be able to access
the metrics via:
http://machine-0-address:19090/agents/machine-0/metrics
The juju-introspection application is relatable to
~prometheus-charmers/prometheus.
I'll send another email later with more details about the monitoring side
of things, but just wanted to make sure people are aware of this now, to
aide their debugging efforts.
Cheers,
Andrew
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