logger: Fix cache for ignore_same_log_interval
growing unlimitedly
#4229
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Which issue(s) this PR fixes:
What this PR does / why we need it:
With
ignore_same_log_interval
, the cache can grow unlimitedly.This limits the size to 1000.
Specification:
If needed, we can make the max size configurable, but for now, I don't think we need it.
Docs Changes:
Adding an explanation to https://docs.fluentd.org/deployment/logging#ignore_same_log_interval is desirable.
Release Note:
Same as the title.