release-22.2: server: fix log flushDaemon incorrectly ignores syncInterval #93995
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Backport 1/1 commits from #93956 on behalf of @srosenberg.
/cc @cockroachdb/release
flushDaemon runs in background and invokes lockAndFlushAndMaybeSync at every flushInterval (default is 1 second). Every syncInterval (default is 30 seconds) it's supposed to set doSync so that the subsequent call to lockAndFlushAndMaybeSync will result in file.Sync in addition to Flush.
The faulty logic caused doSync to be always false; i.e., file.Sync was never issued and may have resulted in truncated server logs. This fix restores the intended behavior, thereby issuing file.Sync at every syncInterval.
Epic: none
Release note (bug fix): server logs are now correctly fsynced at every syncInterval
Release justification: bug fix