Fix grafana 404 in some scenarios

[w13915984028]

Problem:

Grafana is not working in some scenairos.

Solution:

Add processing for all scenarios

This PR also includes all commits in #664

UI issue: harvester/harvester#5217, UI fix: harvester/dashboard#958

NOTE
In Harvester v1.2.1 & v1.2.2, there are some slightly differences in grafana, the PR and workaround will be made separately. DO NOT merge automatically. PR for v1.2.2: #666

Related Issue:
harvester/harvester#5221

Test plan:

Grafana can be both embedded in Harvester UI and opened in new UI window, and here are the full scenarios in Harvester.

A local Harvester cluster:

(1) dashboard -> embedded grafana & link -> grafana new window; login
(2) vm -> vm metrics, embedded grafana
(3) addon-> grafana link-> grafana new window (not working, UI fix harvester/dashboard#958); login`(not working, this fix: ~./dashboard/harvester/c/(c-m-.+)/harvesterhci.io.addon/cattle-monitoring-system/. '"appSubUrl":"/k8s/clusters/$1/api/v1/namespaces/cattle-monitoring-system/services/http:rancher-monitoring-grafana:80/proxy"';
)

Rancher managed cluster:

(1) Rancher- > virtualization management -> click cluster to open, then repeat all above operation
(2) Rancher- > virtualization management -> click "Manage" to open a new manage window, then explore, the grafana is embedded. (not working: this fix, ~./dashboard/c/(c-m-.+)/. '"appSubUrl":"/k8s/clusters/$1/api/v1/namespaces/cattle-monitoring-system/services/http:rancher-monitoring-grafana:80/proxy"';
)

Note:
In Rancher, virtualization management, the result is different when click the link of cluster name and click Manage.
Need to validate all them.

[w13915984028]

@Mergifyio backport v1.3

[mergify]

backport v1.3

❌ No backport have been created

• Backport to branch v1.3 failed

GitHub error: Branch not found

[w13915984028]

NOTE
In Harvester v1.2.1 & v1.2.2, there are some slightly differences in grafana, the PR and workaround will be made separately. DO NOT backport merge this PR automatically. Another PR will be added for v1.2.2.

PR for v1.2.2 #666

[bk201]

This PR also includes all commits in #664

Do we need to co-author https://github.com/stalin4suse in the commit?

[w13915984028]

This PR also includes all commits in #664

Do we need to co-author https://github.com/stalin4suse in the commit?

Sure, at the time of commiting, did not have his info, now is updated.

[ibrokethecloud]

lgtm. thanks.
I was able to re-produce the cluster by exploring the harvester 1.3.0-rc3 cluster via cluster explorer view in Rancher. The Cluster dashboard is unable to render the grafana content.

To test, patched the grafana-nginx-proxy-config configmap in the cattle-monitoring-system namespace, and delete the existing grafana pod.

Once grafana is running, cluster explorer is able to render the grafana dashboards.