This is an umbrella task to track what was discussed in the design documents, with the subsequent implementation plan:

1. pt-heartbeat + scaffolding
   • Create the prometheus http exporter scaffolding
   • Implement the custom pt-heartbeat monitoring
   • Create the related alert rule(s)
2. seconds_behind_master + threads (replication/io)
   • Add the show slave status; parsing
   • Create the related prometheus-node-exporter alert rule(s)
3. memory pressure
   • *Implement custom memory monitoring if needed*
   • Create the related alert rule(s)
4. disk pressure
   • *Implement custom disk monitoring if needed*
   • Create the related alert prometheus-node-exporter rule(s)
5. read only status
   • *Implement custom query if needed*
   • Create the related mysqld-exporter alert rule(s)
6. process monitoring
   • *Implement custom system probe if needed*
   • Create the related systemd unit alert rule(s)
7. mariadb errors
   • decide upon feature parity → this task will cost time, as it requires custom designs and gets out of prometheus "canonical" use case
   • This task will be a bit longer than the others as it requires a bit more testing
     • Implement a proof of concept of error message passing
     • Productionize the POC
   • Create the related alert rule(s)