Note: Hmm, I'm not sure. When the service is launched in production, we will get an operational metrics dashboard like this one (https://grafana.wikimedia.org/d/5CmeRcnMz/mobileapps?orgId=1) "for free" (i.e., based on some behind-the-scenes preparatory work from SRE). We could either add our additional metrics to this dashboard when it's created, or create a separate dashboard for the more service-specific metrics like queue size, provider API latency, etc.
Acceptance Criteria
- Add service-specifc metrics to https://grafana.wikimedia.org/d/NQO_pqvMk/push-notifications?orgId=1&refresh=1m