Hi,
On 31/10/2019 11:11, root wrote: > I've blindly upgraded prometheus 1.5.2+ds-2+b3 to 2.7.1+ds-3+b11 and > this automatically removed all my historical data from > /var/lib/prometheus/metrics/. I had to rollback because new version > requires new configuration and finding solution on keeping historical > data. As developers provided no way to convert to new format most > probable solution will be to stuck on pre 2.0 version. Dramatic > changes like that are dangerous and should not happen so easy. Unless there is something broken, you should have gotten a notice while upgrading that informs you of the breaking changes. Also, did it remove you data or just ignored it? This is the text you should have gotten from APT: prometheus (2.0.0+ds3-1) unstable; urgency=medium BREAKING CHANGES The data format in Prometheus 2.0 has completely changed and is not backwards compatible with 1.x. Prometheus 2 will create a new data directory in /var/lib/prometheus/metrics2. The old data in /var/lib/prometheus/metrics can not be read by the new version. There is no conversion tool; if you want to retain access to the old data, it is necessary to run a separate Prometheus 1.x instance on that data directory. (This package makes no provision to allow this.) -- Martina Ferrari (Tina, the artist formerly known as Tincho)