It seems that similar problems that existed in beijing that seems it has been reintroduced in casablanca with regards to logging that affects PDP components:

The apperance of "common-modules" directory under onap:

policy@dev-pap-85b85ff5b9-x8552:/var/log/onap$ ls
common-modules policy

policy@dev-pap-85b85ff5b9-x8552:/var/log/onap$

policy@dev-pap-85b85ff5b9-x8552:/var/log/onap$ ls -l common-modules/*
total 964
rw-rr- 1 policy policy 0 Oct 17 00:21 audit.log
rw-rr- 1 policy policy 472865 Oct 17 01:00 debug.log
rw-rr- 1 policy policy 510530 Oct 17 00:23 error.log
rw-rr- 1 policy policy 0 Oct 17 00:21 metrics.log

policy@dev-pap-85b85ff5b9-x8552:/var/log/onap$ ls -l policy/*
policy/catalina:
total 4
rw-rr- 1 policy policy 274 Oct 17 00:22 localhost_access_log.2018-10-17.txt

policy/console:
total 8
rw-rr- 1 policy policy 6550 Oct 17 00:22 catalina.2018-10-17.log
rw-rr- 1 policy policy 0 Oct 17 00:21 host-manager.2018-10-17.log
rw-rr- 1 policy policy 0 Oct 17 00:21 localhost.2018-10-17.log
rw-rr- 1 policy policy 0 Oct 17 00:21 manager.2018-10-17.log

policy/db:
total 1184
rw-rr- 1 policy policy 0 Oct 17 00:21 db_upgrade_remote_20181017002116.err
rw-rr- 1 policy policy 1210663 Oct 17 00:21 db_upgrade_remote_20181017002116.log

policy/ep_sdk_app:
total 144
rw-rr- 1 policy policy 0 Oct 17 00:21 application.log
rw-rr- 1 policy policy 419 Oct 17 00:21 audit.log
rw-rr- 1 policy policy 131426 Oct 17 00:22 debug.log
rw-rr- 1 policy policy 1319 Oct 17 00:21 error.log
rw-rr- 1 policy policy 425 Oct 17 00:21 metrics.log

policy/pap:
total 100
rw-rr- 1 policy policy 0 Oct 17 00:21 audit.log
rw-rr- 1 policy policy 7320 Oct 17 00:21 catalina.2018-10-17.log
rw-rr- 1 policy policy 0 Oct 17 00:21 host-manager.2018-10-17.log
rw-rr- 1 policy policy 0 Oct 17 00:21 localhost.2018-10-17.log
rw-rr- 1 policy policy 0 Oct 17 00:21 manager.2018-10-17.log
rw-rr- 1 policy policy 0 Oct 17 00:21 pap-rest-reqres.log
rw-rr- 1 policy policy 90880 Oct 17 00:22 pap-rest.log

policy/paplp:
total 100
rw-rr- 1 policy policy 96693 Oct 17 01:02 stdout

policy/xacml-pap-rest:
total 132
rw-rr- 1 policy policy 1563 Oct 17 00:22 audit.log
rw-rr- 1 policy policy 115149 Oct 17 01:02 debug.log
rw-rr- 1 policy policy 3753 Oct 17 00:22 error.log
rw-rr- 1 policy policy 4476 Oct 17 00:22 metrics.log

In the PDP, also see this problem in logs (errors are not logged):

==> common-modules/integrity-monitor/error.log <==
2018-10-17T01:09:32.662Z|||Thread-7||||ERROR|||||com.att.eelf.error||POLICY-515E ERROR: java.io.FileNotFoundException: /var/log/onap/policy/pdpx/pdp-rest.log (No such file or directory)