Thanks for using Bitnami. According to your bnsupport bundle, it looks like your PHP-FPM service can't handle the total amount of request that your website is receiving. Do you know if your website is under high traffic?
[28-Dec-2019 15:40:22] WARNING: [pool moodle] seems busy (you may need to increase pm.start_servers, or pm.min/max_spare_servers), spawning 32 children, there are 6 idle, and 158 total children
We highly recommend you to create a backup of the config file in use so you can restore the default values in case you find issues.
sudo cp /opt/bitnami/apache2/conf/bitnami/httpd-2xlarge.conf /opt/bitnami/apache2/conf/bitnami/httpd-2xlarge.conf.bck
Can you increase the values in the file
/opt/bitnami/apache2/conf/bitnami/httpd.conf for the
After that, restart services for changes to take effect with
sudo /opt/bitnami/ctlscript.sh restart
Hope it helps,