MongoDB Backups: Basic Monitoring and Alerting

https://www.notion.so/percona/MongoDB-Backups-Monitoring-and-Alerting-1648b4e2ff0d4079ad182ceaae1d4cba

Proposed solution: Expose backup results and process (status - in progress, for example ) as metrics. 

Then we can use Alerting and dashboards to be shipped together  with PMM.

LAter - add Alert rule by default for all backups