Metric Server :: Support Multiple Providers

[thisthat]

Goal

Support multiple provider instances.

Technical Details

Currently, an evaluation can support multiple providers, but only a single instance of each provider can be configured, e.g., as a user, I cannot have two different Prometheus installations.

The KeptnMetric CRD has a field spec.provider.name which is used to decide which provider among Prometheus, Dynatrace, and Datatog is used. Similarly, the KeptnMetricsProvider requires a CR to have the metadata.name equal to one of the supported Observability platforms.

KeptnMetricProvider CRD shall provide a new field spec.type that can be only one of the supported Observability platforms.
The controller should then change behavior and use the new field to decide which implementation to use for fetching the metrics.
The spec.provider.name is used only to match the KeptnMetricsProvider CR configuration.

Acceptance Criteria

• New CRD version and set it as hub version
• Controller and CRD are updated to support spec.type
• Add validation for the spec.type field to check that has one of the following: dynatrace|datadog|prometheus|dql

DoD

• Multiple provider instances can be used
• Unit/Component/Kuttl tests

[StackScribe]

How will multiple Prometheus (for example) appear elsewhere in the cluster? Will there be multiple *name fields in the metadata so the user can define names?

[rakshitgondwal]

Is this issue open fo grabs?

[mowies]

I think we will handle this issue in the core maintainer team, sorry 😇