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(Re) evaluate effectiveness / usefulness of varnish/haproxy traffic drop alerts
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Description

I (Filippo) have seen these alerts fire reasonably frequently (both in -operations and -traffic), but hardly ever be actionable in an meaningful way (except maybe look at dashboards). They also fire during high traffic incidents, obviously after the peak has passed and there's now a "drop" in traffic. For these reasons I think we should re-evaluate the alerts and see if they are still effective, useful, wanted, etc.