Autogenerate dashboard_alt_uid on the provider side

[sed-i]

Issue

Solution

In tandem with:

• Automatically overwrite dashboard UIDs with a prescribed naming pattern, on the provider side grafana-k8s-operator#363
• Add dashboard uid generation helper cos-lib#114

Context

Testing Instructions

Tested with the new lib :

graph LR
ubuntu --- hardware-observer --- grafana-agent ---|CMR| grafana
ubuntu2 --- hardware-observer
ubuntu --- grafana-agent
ubuntu2 --- grafana-agent

Loading

default-base: [email protected]/stable
saas:
  graf:
    url: microk8s:admin/graf.graf
applications:
  ga:
    charm: local:grafana-agent-11
  ho:
    charm: local:hardware-observer-0
    resources:
      perccli-deb: 1
      sas2ircu-bin: 1
      sas3ircu-bin: 1
      storcli-deb: 1
  ub:
    charm: ubuntu
    channel: latest/stable
    revision: 25
    num_units: 2
  ub2:
    charm: ubuntu
    channel: latest/stable
    revision: 25
    num_units: 1
relations:
- - ho:general-info
  - ub:juju-info
- - ho:general-info
  - ub2:juju-info
- - ho:cos-agent
  - ga:cos-agent
- - ga:juju-info
  - ub:juju-info
- - ga:juju-info
  - ub2:juju-info
- - ga:grafana-dashboards-provider
  - graf:grafana-dashboard

Upgrade Notes

See upgrade notes for canonical/grafana-k8s-operator#363.