The expiry of the certificate for the agents are not the same even if the agents are installed on the same date.
For example:
DB Service agent:
U02000308 Agent certificate file '.\security\DB_SERVICE01.cert' was loaded, expiration date 'Tue Mar 18 10:09:54 CDT 2025'.
SQL Agent:
U02000308 Agent certificate file '.\security\SQL.cert' was loaded, expiration date 'Fri Mar 28 19:28:25 CDT 2025'.
CA Automic Workload Automation - Automation Engine: v21.x
By design.
It is normal because there's a key called AGENT_CERTIFICATE_END_SPREAD in the UC_AGENT_TLS_SETTINGS variable. The AWA system makes sure that not all agent's certificate expire at the same time.
Reference: