Add PrometheusMissingRuleEvaluations runbook

[aisbaa]

A quick runbook to mitigate PrometheusMissingRuleEvaluations alert.

ref.:

• https://prometheus.io/docs/prometheus/latest/configuration/recording_rules/#rule_group
• https://www.robustperception.io/rule-groups-for-hierarchical-aggregation/

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[aisbaa]

Not sure what failed in checks, for some reason logs are not available.

[aisbaa]

@multani this looks great! Thank you for adding! I'm new to this collaboration interface, should I commit? Or would you like to commit these suggestions?

[multani]

@aisbaa I'm not sure I can commit in your branch, but if you open the "File changed" tab at the top-right, you should be able to batch all the changes and commit them all at once.

[aisbaa]

Thank you, just did that.