In AMQ 7.5's templates the values of the following environment variables are stored in a secret:

AMQ_USER
AMQ_PASSWORD
AMQ_CLUSTER_USER (clustered broker deployments)
AMQ_CLUSTER_PASSWORD (clustered broker deployments)
AMQ_TRUSTSTORE_PASSWORD (SSL-enabled broker deployments)
AMQ_KEYSTORE_PASSWORD (SSL-enabled broker deployments)

According to template it should use below default value for variables if not defined :

  name: amq-broker-75-persistence-clustered-ssl
objects:
- apiVersion: v1
  kind: Secret
  metadata:
    annotations:
      description: Credentials used in broker config. Default values are admin(AMQ_USER and AMQ_PASSWORD), clusteruser(AMQ_CLUSTER_USER), clusterpassword(AMQ_CLUSTER_PASSWORD), password(AMQ_TRUSTORE_PASSWORD and AMQ_KEYSTORE_PASSWORD)
    name: amq-credential-secret
  type: Opaque
  data:
    ${AMQ_USER}: YWRtaW4=
    ${AMQ_PASSWORD}: YWRtaW4=
    ${AMQ_CLUSTER_USER}: Y2x1c3RlcnVzZXI=
    ${AMQ_CLUSTER_PASSWORD}: Y2x1c3RlcnBhc3N3b3Jk
    ${AMQ_TRUSTSTORE_PASSWORD}: cGFzc3dvcmQ=
    ${AMQ_KEYSTORE_PASSWORD}: cGFzc3dvcmQ=

However it creates random value and does not use the default one.

Also in amq-credential-secret table, the randomly generated value is used as key and its value is used as default values instead of variable name. Please refer attached screenshot to understand the issue.

According to screenshot WebhRQ8G is key and its value is clusterpassword.

However in actual case WebhRQ8G is randomly generated value for AMQ_CLUSTER_PASSWORD.

Similarly rEDXFBf0 is key and admin is value. However AMQ__PASSWORD should be key and admin as value according to template.

So basically there are two issues :

1. It does not use default values defined in template.
2. The amq-credential-secret table shows incorrect key-value pair.