Github user zwoop commented on the issue:
https://github.com/apache/trafficserver/issues/1602
Not reloadable. The setting restores the old/expected behavior, meaning
1. It will not let you start traffic_server with a bad ssl_multicert.config
2. It will not replace a running, functional configuration with a broken
ssl_multicert.config
I honestly don't know how we made this "off" by default, but I've filed an
issue already to make the default for this to be "1" for v8.0.0.
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