Ingester: Ingester TSDB OOO sample delta metric always show 0 #6850
Description
Describe the bug
There is a histogram metric in Cortex Ingester called cortex_ingester_tsdb_sample_ooo_delta. It is used to track how old a sample (timestamp delta) is when it hits out of order or out of bound errors.
I have a Cortex cluster where we keep having out of order and out of bounds sample issues. However, this metric seems remain 0 and doesn't seem to work.
Expected behavior
I am able to use cortex_ingester_tsdb_sample_ooo_delta metric to get the ingestion delay (seconds delta) on the ingester.
Alternative Solution
#6748 can be an alternative solution.