fix: initialize histogram buckets to 0 to avoid them being downsampled #4368
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What this PR does:
The same fix we did for counters here:
#4236
seems to be needed for histogram buckets, so for every bucket, a first 0 series is added back to the previous minute
Checklist
CHANGELOG.md
updated - the order of entries should be[CHANGE]
,[FEATURE]
,[ENHANCEMENT]
,[BUGFIX]