hi,
I have a question about prometheus 2.0 version.
as I know, PMM use prometheus 1.8.2 version.
but the level db is very heavy.
and sometimes prometheus was crashed by the level db.
https://github.com/prometheus/prometheus/issues/3038
as you can see in this web page, the level db is not used any more in prometheus 2.0 version.
so please check upgrading prometheus version.
thanks!