Hi,
I upgraded to 7.7 from 7.6.1 yesterday, i have been using the keystore in logstash and storing the value in /etc/default/logstash. After upgrading i had some fun with Logstash not staring, the LOGSTASH_KEYSTORE_PASS= value had been removed from /etc/default/logstash. Resolved now but an FYI
Kind regards
Phil