nrpe relations must use nrpe-specific endpoints if available

[esunar]

Although we alert if a required relation to nrpe is missing, we do not check the relation type.

For charms that expose a nrpe-external-master or local-monitors endpoint, we should alert if a relation toward nrpe is present, but only uses the juju-info endpoint.

For charms that do not expose such endpoints, a relation using juju-info should be deemed sufficient.

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Imported from Launchpad using lp2gh.

• date created: 2020-04-16T19:09:39Z

• owner: aieri

• assignee: None

• the launchpad url

[esunar]

(by ec0) I'd think that adding specific endpoint names to relation checking generally would be a good feature.