db1114 is a host running buster+mariadb 10.3.
Its MySQL is at: https://grafana.wikimedia.org/d/000000273/mysql?orgId=1&var-dc=eqiad%20prometheus%2Fops&var-server=db1114&var-port=9104&from=now-24h&to=now
As it can be seen, there are some graphs that don't contain any data:
- Monitoring queries latency
- InnoDB Purge Lag
- Change Buffer
- Adaptive Hash and other memory usage
- InnoDB Semaphores
A possible explanation is that some metrics/options might have changed within information_schema and performance_schema on newer versions than 10.1 (the one we currently use in production) as we saw on T231182: Tendril activity column: trx_adaptive_hash_latched column removed on 10.2 (and onwards) from information_schema.innodb_trx causes the `*_activity` event to fail
One of the blockers (apart from lots of more testing) is the fact that don't have full visibility at the moment on 10.3.
Update: the MySQL specific variables have been removed on 10.3 on upstream: https://jira.mariadb.org/browse/MDEV-18582