The if periodic GC is disabled but periodic gc logging enabled, there are regular debug level log messages (e.g. with gc*=debug) that look like the following:

[0.204s][debug][gc,periodic] Last GC occurred 9462349824ms before which is below threshold 0ms. Skipping

The log message frequency is pretty high (every 300ms by default) that contains a random time span since the last_gc_time variable has not been initialized properly in this case.

Do not print these log messages if periodic gcs are disabled, and add a single log message at startup indicating whether periodic gcs are disabled/enabled at all.