Support metrics endpoint

[making]

https://github.com/etcd-io/etcd/blob/master/Documentation/op-guide/monitoring.md#metrics-endpoint
It would be great if metrics endpoint flag is enabled and etcd can be monitored by prometheus-bosh-release.

[cf-gitbot]

We have created an issue in Pivotal Tracker to manage this:

https://www.pivotaltracker.com/story/show/160352833

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[alex-slynko]

Hi @making

This idea definitely makes sense. Please send us the PR to allow us optionally enable this flag and we will merge it.

[making]

Sorry, I misunderstood. The endpoint has been already enabled.
I was able to access /metrics

curl --cert /var/vcap/jobs/etcd/config/etcd.crt --key /var/vcap/jobs/etcd/config/etcd.key --cacert /var/vcap/jobs/etcd/config/etcd-ca.crt -k -v https://localhost:2379/metrics

[alex-slynko]

Hi @making

I would like to mention that etcd 3.3 allows operator to specify custom property to disable authentication from /metrics endpoint etcd-io/etcd#8060

This property is not exposed yet. I thought you meant exposing it. We will accept PR for exposing this optionally, so the operator can choose the best thing for their environment.

[making]

Ok, I'll make a pr to expose --listen-metrics-urls.
Is there any policy to test the change?

[cf-gitbot]

We have created an issue in Pivotal Tracker to manage this:

https://www.pivotaltracker.com/story/show/160460856

The labels on this github issue will be updated when the story is started.