Ran the discovery with update switch this morning after update -- no errors. Have also kicked off a yum update (Centos 7.6.1810) and restarted httpd. Issue persists.
Updated to revision 9661.
[someguy@observium observium]# ./discovery.php -u
___ _ _
/ _ \ | |__ ___ ___ _ __ __ __(_) _ _ _ __ ___
| | | || '_ \ / __| / _ \| '__|\ \ / /| || | | || '_ ` _ \
| |_| || |_) |\__ \| __/| | \ V / | || |_| || | | | | |
\___/ |_.__/ |___/ \___||_| \_/ |_| \__,_||_| |_| |_|
Observium Professional 19.1.9661
-- Updating database/file schema
386 -> 387 # (db) . Done (0s).
387 -> 388 # (php) Renaming files containing commas [...................................................................................................................................................................................................................................................................] Done (3s).
388 -> 389 # (db) .. Done (0s).
389 -> 390 # (db) ... Done (0s).
390 -> 391 # (db) .. Done (0s).
391 -> 392 # (db) . Done (0s).
392 -> 393 # (db) ... Done (0s).
393 -> 394 # (db) . Done (0s).
394 -> 395 # (db) . Done (1s).
395 -> 396 # (db) .. Done (0s).
396 -> 397 # (db) ......... Done (3s).
-- Done.