Prometheus retention time set to 1 year but not keeping data beyond default 15 days

Question

I've recently installed Prometheus and am using Grafana for reporting.

I set up Prometheus during installation to have retention time of 1 year using:

--storage.tsdb.retention.time=1y

Now, we noticed from yesterday that data from 15 days prior wasn't showing up anymore. Is there something wrong with my code? Is 1y not being recognised?

Did you check this answer? https://stackoverflow.com/a/59300232/1563297 — Sergio Santiago, Dec 27 '19 at 00:37
Look at other flags also https://www.robustperception.io/configuring-prometheus-storage-retention — Boris Ivanov, May 18 '20 at 19:15

score 5 · Answer 1 · answered May 19 '20 at 08:43

You need to set command line options in ur startup file (f.e. prometheus.service)

--storage.tsdb.retention.size 120GB \                                                                                                                                                                                                     
--storage.tsdb.retention.time 1825d

In this example I set 120 GB as storage space and 5 years as timeframe to keep data

Prometheus retention time set to 1 year but not keeping data beyond default 15 days

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