Migrate to InfluxDB 2.0
We currently use the latest InfluxDB 1.8. We should eventually upgrade to InfluxDB 2.0; I have been told 1.x support will be kept "at least until the end of 2021".
InfluxDB 2.0 brings significant changes, even some at the conceptual level (eg. databases and retention policies are both replaced with "buckets", and there's a new query language). Data migration is required; if this means temporarily taking up 2x the disk space, it won't fit in overwatch so I'll need to do the migration elsewhere and then copy the data. The old query language is still supported for compatibility, so Grafana and our existing dashboards should still work. Continuous Queries (used to aggregate old data) need to be rewritten though.
I'll definitely need to experiment with it locally first.