MySQL outage, specific to 10.1.19 rolled out last week. Segfault on innodb recovery. Investigating further.
6:46 PM EST - corruption on recovering one or more InnoDB tables in the log. Moving forward with disabling some databases to tease out what IBD tables are problematic.
6:55 PM EST - corrupted database teased out. Informed account holder
7:13 PM EST - client database responsible for InnoDB crash has been wiped and restored from backup thereby removing corrupted pages from InnoDB pool. Continuing to monitor MySQL closely.