Andrey,

Got it, and I just saw Prometheus doing that on a test instance.

What is the retention size overhead that should be prudent to leave for 
housekeeping? On a 100 GB volume dedicated to Prometheus data, what's the 
best way to estimate the maximum safe value for storage.tsdb.retention.size?

There are two factors here I am concerned with:
- if the limit is only checked once in a while, it may go over it as new 
data keeps being written
- once every 2 hours, as it's moving WAL files and checkpoints around, it 
may temporarily surpass the size limit


On Monday, February 24, 2020 at 12:43:08 PM UTC-8, Andrey Kezikov wrote:
>
> Default value is 2h, so we can assume that check happening every two hours 
> if min block param has't been changed

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