Support Metrics Router configuration for platform metrics

[PatrickDuncan]

Description

https://cloud.ibm.com/docs/metrics-router?topic=metrics-router-getting-started

Use IBM Cloud® Metrics Routing to configure the routing of platform metrics generated in your IBM Cloud account.

The VSI on VPC landing zone Deployable Architecture already supports an add_atracker_route boolean that creates an atracker COS target and a route for auditing events.

VSI for VPC publishes important platform metrics regarding the VSIs; a Monitoring instance and metrics-router route should also be created as part of the DA.

• Use the existing Observability instances module to manage a Monitoring instance: https://github.com/terraform-ibm-modules/terraform-ibm-observability-da/tree/main/solutions/instances
• Allow an existing Monitoring CRN to be provided instead. Metrics Router supports cross account and cross region.
• Manage a Metrics Router route in the Deployable Architecture. The interface should match ATracker.

New or affected modules

• I believe a new metrics-router module needs to be created.

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[rajatagarwal-ibm]

I have picked up this issue - instead of creating a new repo ,I will use this repo https://github.com/terraform-ibm-modules/terraform-ibm-observability-instances and create a metrics routing module.

[rajatagarwal-ibm]

In the deep-dive call on 27/8, decided to create an epic for this and track that in AHA. Also, needs more information on the requirement (urgency).

[ocofaigh]

@PatrickDuncan A new module has been created to support metrics routing: https://github.com/terraform-ibm-modules/terraform-ibm-observability-instances/tree/main/modules/metrics_routing

We plan to expose this in the Cloud automation for Observability DA (which is currently in the Community registry of IBM Cloud). That work is being tracked internally here. There won't be any explicit call to this in the landing zone DA, so I'm going to close this issue. Feel free to reach out internally if you have any concerns of feedback