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Add icinga alert for anomalous logstash.rate.mediawiki.memcached.ERROR.count

Authored by bd808.

Description

Add icinga alert for anomalous logstash.rate.mediawiki.memcached.ERROR.count

Setup an icinga alert to complain if more than 15% of the last 100
memcached errors per minute counts from MediaWiki are above the
Holt-Winters predictive model rate.

Bug: T69817
Change-Id: I011f583b51862e54e653e9a900635c9ddf1e06e6