Thank you.
Oa core is running:
And diagnostic logs are very old:
ls -lrt *.log
-rw-r--r-- 1 orauser dba 10470038 Dec 16 12:03 oacore_server1-diagnostic-74.log
-rw-r--r-- 1 orauser dba 10479489 Dec 16 16:06 oacore_server1-diagnostic-75.log
-rw-r--r-- 1 orauser dba 10462534 Dec 17 11:25 oacore_server1-diagnostic-76.log
-rw-r--r-- 1 orauser dba 10469549 Dec 17 14:22 oacore_server1-diagnostic-77.log
-rw-r--r-- 1 orauser dba 10474503 Dec 17 15:45 oacore_server1-diagnostic-78.log
-rw-r--r-- 1 orauser dba 10457718 Dec 17 20:52 oacore_server1-diagnostic-79.log
-rw-r--r-- 1 orauser dba 10453948 Dec 18 12:01 oacore_server1-diagnostic-80.log
-rw-r--r-- 1 orauser dba 10478776 Dec 21 08:08 oacore_server1-diagnostic-81.log
-rw-r--r-- 1 orauser dba 10458767 Dec 21 17:44 oacore_server1-diagnostic-82.log
-rw-r--r-- 1 orauser dba 2951174 Dec 22 10:51 oacore_server1-diagnostic.log
-rw-r--r-- 1 orauser dba 4161153 Mar 26 16:50 access.log
-rw-r--r-- 1 orauser dba 1916084 Mar 26 16:50 oacore_server1.log
Regards.