Hi.
As a starting point, it would be interesting to know if the whisper files are really no longer present.
Maybe you could look for the whisper files (e.g. at /opt/graphite/storage/whisper/icinga2/…) and check if older performance-data is present.
Look for the tool whisper-fetch.py, which accepts an “Unix Epoch Timestamp” for the argument
"--from"
Syntax:
/path/to/whisper-fetch.py <path-to-whisper-file> --from=<timestamp_from_when> [--pretty]
Example:
/opt/graphite/bin/whisper-fetch.py max.wsp --from=1624177772 --pretty
# or : /opt/graphite/bin/whisper-fetch.py max.wsp --from=1624177772 --pretty | head
If there is no data present older than 1 day, you should have a look at the
storage-schemas.conf. This excellent post might be helpful.
Hope it helps.
Greetings.