Hi All,

We are using prometheus version 2.48.0 and enabled out_of_order_time_window 
to 1d. 

Promethues A and Prometheus B are in same version

Prometheus A normally remote writes to Prometheus B. Prometheus A receives 
data from a fleet of Prometheus Agents . 

Prometheus A was done for 45 minutes and once recovered it received all the 
data from Prometheus Agent but those metrics didn't reach our Prometheus B 
which is our long term storage.

We generated the backfill metrics in Openmetrics format  from Prometheus A 
for the missing time  tried to push it to Prometheus B using the remote 
write endpoint using promtool.
 
It failed with below error.

HTTP 500 - Too old sample on Prometheus A

On Prometheus B we can see the below error.

{"caller":"write_handler.go:76","component":"web","err":"too 
oldsample","level":"error","msg":"Error appending remote write"}

Can get any assistance on why this is happening ?





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