Add detection of missing metadata service to OpenStack service checks

[sudeephb]

We encountered a problem on a cloud where instances were successfully setting up network routes roughly 50% of the time. This was due to a missing metadata proxy on one of the DHCP agents.

This log message was detected in cloud-init output as one of the instances was being created:

[ 31.695675] cloud-init[783]: 2019-09-26 16:30:46,217 - util.py[WARNING]: No active metadata service found

We should add a check to our Rally checks so that we can detect this message and trigger an alert on it.

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Imported from Launchpad using lp2gh.

• date created: 2019-09-30T23:12:04Z

• owner: vultaire

• assignee: None

• the launchpad url

[sudeephb]

(by eric-chen) This charm is no longer being actively maintained. Please consider using the new Canonical Observability Stack instead. (https://charmhub.io/topics/canonical-observability-stack) I will close this feature request