Grafana dashboard: Gerrit - NOTEDB Latency

# Gerrit NoteDB Latency dashboard

This dashboard is being maintained as part of the [gerrit-monitoring project](https://gerrit-review.googlesource.com/admin/repos/gerrit-monitoring). It is meant to be used with the [metrics-reporter-prometheus plugin](https://gerrit-review.googlesource.com/admin/repos/plugins/metrics-reporter-prometheus) for Gerrit and Prometheus. The project provides a Kubernetes-based setup to install a complete monitoring and logging stack. Multiple dashboards are available.

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