It appears that, if there is a connectivity issue with dmaap when various policy components start up, the components may crash. This has been observed with xacml-pdp and may affect others, as well. May not actually be related to dmaap. Needs further investigation.
Saw this in an email on onap-discuss (may or may not be the cause of the crash-loop):
dev-policy-xacml-pdp-688584f6d9-js77z 0/1 CrashLoopBackOff
Caused by: java.security.cert.CertificateExpiredException: NotAfter: Thu Mar 25 04:23:49 GMT 2021