Rename metric to match new exporter version

Matt Smileyrequested to merge
rename_sidekiq_metrics_for_gl_exporter_upgrade into master

When we upgrade the gitlab-exporter for sidekiq-redis, the new exporter version renames 4 metrics. 1 of those metrics is referenced by the dashboard and recording rule definitions here in the runbooks repo:

sidekiq_queue_latency renamed to sidekiq_queue_latency_seconds

We should merge and apply this runbooks change at roughly the same time as we upgrade the gitlab-exporter for sidekiq-redis, so that we have an acceptably small monitoring gap.

Alternately, if we prefer to, we could temporarily adjust the PromQL to work with either the old or new metric name, which would decouple the two changes.

Issue: gitlab-com/gl-infra/scalability#1029 (comment 591568530)

Dashboard snapshot available at https://dashboards.gitlab.net/dashboard/snapshot/mvut0393THIB3r8Nn2hPtTTW0X7DyULA?orgId=1&var-PROMETHEUS_DS=Global&var-environment=gstg&var-stage=main (staging has been updated so the new metrics are available)

Edited by Craig Miskell

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