feat(alerts): improve mechanical alerts

Andrew Newdigaterequested to merge
improved-mech-alerts into master

A lick of paint for the mechanical sympathy alerts: adds feature category reporting, max values, sample sizes and a link to a new ELK rails endpoint dashboard, which I think will be super helpful for diagnosing problems.

image

https://gitlab.slack.com/archives/CM5EQH125/p1617818620016700

Edited by Andrew Newdigate

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