Make individual alerts disable-able

[richardTowers]

Context

At the moment users of prometheus-boshrelease are able to configure thresholds and evaluation times for alerts, but not much else.

For example, if you wanted to exclude the diego cells from a CPU alert you would need to edit the expr: itself. Similarly, if you want to replace an alert it's not possible to remove alerts in this boshrelease with an ops file.

A modest proposal

Wrap each alert in a conditional so that they can be disabled and replaced with custom alerts. Introduce a new variable in the alerts jobs where you can list the alerts you want to disable.

[frodenas]

Sounds good to me, are you willing to submit a PR with those changes? :)

[richardTowers]

Yep, I'll have a look.

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