Availability data missing...?

CMK version:
OS version:
Centos 7 & 8

Error message:

Despite our system being up for 90 days since the last reload due to outage,
I’m unable to find any of the host availability data except for the past month.
If I try to select a given host group and view it’s timeline, it seems all availability was missing prior to Aug 02… which system files should I be trying to audit to determine if there was some unexpected/unannounced change/deletion?

Output of “cmk --debug -vvn hostname”: (If it is a problem with checks or plugins)