increase db retain period in ingesters to cover index cache validity period as well #3300
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…period as well refactor ingester store query config to simplify the code
sandeepsukhani
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What this PR does / why we need it:
We encountered that internal canaries were reporting missing logs intermittently.
While the logs were there in the storage they were sometimes not being returned in the query results.
Investigating the queries which had the problem I noticed that we were not retaining dbs long enough to cover the expiry of the cached index by queriers. We need to cover the expiry as well since queriers could keep serving chunks for stale index which could be missing recently flushed chunk ids.
I have also refactored the code to simplify the calculations of various durations for boltdb-shipper a bit.