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Reword storage docs on corruption issues

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Reword the section on what to do if major corruption happens. Users are
being confused by the existing wording and cherry-picking the meaning
from the single sentance about durability.

Signed-off-by: SuperQ <superq@gmail.com>
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SuperQ 2024-08-09 10:48:55 +02:00
parent cf62fb5c44
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docs/storage.md
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@ -117,13 +117,12 @@ time series you scrape (fewer targets or fewer series per target), or you
can increase the scrape interval. However, reducing the number of series is
likely more effective, due to compression of samples within a series.
If your local storage becomes corrupted for whatever reason, the best
strategy to address the problem is to shut down Prometheus then remove the
entire storage directory. You can also try removing individual block directories,
or the WAL directory to resolve the problem. Note that this means losing
approximately two hours data per block directory. Again, Prometheus's local
storage is not intended to be durable long-term storage; external solutions
offer extended retention and data durability.
If your local storage becomes corrupted to the point where Prometheus will not
start it is recommended to backup the storage directory and restore the
corrupted block directories from your backups. If you do not have backups the
last resort is to remove the corrupted files. For example you can try removing
individual block directories or the write-ahead-log (wal) files. Note that this
means losing the data for the time range those blocks or wal covers.
CAUTION: Non-POSIX compliant filesystems are not supported for Prometheus'
local storage as unrecoverable corruptions may happen. NFS filesystems