Discovery Does Not Register with Metrics Service (tested on Zowe 2.14 and 2.16)

[timgerstel]

Describe the bug
Using the metrics-service web UI, it appears only the gateway and caching-service are able to register with the metrics service but not the discovery service.

Potentially related:

Job output is polluted with the following error:
[35m<ZWEAMS1:InstanceMonitor:33751477> [31mERROR[0;39m [36m(c.n.t.m.i.InstanceMonitor)[0;39m Could not initiate connection to host, giving up: [{"messages":[{"messageType":"ERROR","messageNumber":"ZWEAS105E","messageContent":"Authentication is required for URL '/apicatalog/application/hystrixstream'","messageAction":"Provide valid authentication.","messageReason":"Authentication is required.","messageKey":"org.zowe.apiml.security.authRequired"}]}]

Adding components.api-catalog.apiml.metrics.enabled: true in YAML does not remove this error.

Steps to Reproduce

Following this doc: https://docs.zowe.org/stable/user-guide/api-mediation-metrics-service/

1. Set components.metrics-service.enabled: true in YAML
2. Set components.caching-service.apiml.metrics.enabled: true in YAML
3. Set components.discovery.apiml.metrics.enabled: true in YAML
4. Set components.gateway.apiml.metrics.enabled: true in YAML

Expected behavior
Discovery service registers with metrics service, and catalog if required to remove the above error.

Details

• Version and build number: Version 2.16.2 build Security options stauts on GW homepage #191
• Test environment: [either defined Zowe test environment: Marist (1, 2, 3), River, or your own environment: z/OS version and z/OSMF version]

Willingness to help
If you are willing to help with debugging and reproducing the problem or
with fixing the problem, please state your willingness to assist in the created issue.

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