> To capture data for a specific duration, can you provide the URL query
that takes time parameters, such as start and finish times.
No I can't, because there is no feature for that - as the API documentation
makes clear.
> Snapshot creates a snapshot of* all current data *into
snapshots/<datetime>-<rand> under the TSDB's data directory
The snapshot for today includes all the earlier data, of course. So I
presume you could take a snapshot then just delete all the blocks outside
the time period of interest - but I've never tested it. You should be able
to find the time ranges from the meta.json files:
root@prometheus:/var/lib/prometheus/data# cat
01HS1YQS341WWGFYZSN0N8GPR1/meta.json
{
"ulid": "01HS1YQS341WWGFYZSN0N8GPR1",
"minTime": 1709942400000,
"maxTime": 1710525600000,
...
Because these blocks are rolled up, they may cover a fairly wide time
interval. For example, the above block covers 583200000 milliseconds, which
is 6.75 days.
# date --date @1709942400
Sat Mar 9 00:00:00 GMT 2024
# date --date @1710525600
Fri Mar 15 18:00:00 GMT 2024
However, you should note that you won't save much disk space by trimming
snapshots in this way (if that's what you're trying to do). That's because
the snapshots are hardlinks to shared, immutable files. The snapshots will
only take extra space once the main tsdb has started to expire blocks, and
the snapshot contains blocks older than that.
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