fix(blockscout): open /metrics backend path in the proxy; add grafana…

[servalD]

Changes

• Update Grafana and Prometheus versions
• Update existing dashboards
• Open /metrics backend path in the proxy
• Add dashboard for blockscout (coming from this repo and updated to fit the current version and datasource)

[leopaul36]

Getting this with the new Grafana collection:

TASK [grafana.grafana.grafana : Inherit default vars] ****************************************************************************************
fatal: [frontend]: FAILED! =>
  msg: |-
    The task includes an option with an undefined variable. The error was: 'grafana_ini' is undefined. 'grafana_ini' is undefined

    The error appears to be in '/home/leo/Ash/ansible-avalanche-getting-started/ansible_collections/grafana/grafana/roles/grafana/tasks/main.yml': line 2, column 3, but may
    be elsewhere in the file depending on the exact syntax problem.

    The offending line appears to be:

    ---
    - name: Inherit default vars
      ^ here

[leopaul36]

Probably needs a PR on https://github.com/AshAvalanche/ansible-avalanche-getting-started

[servalD]

AshAvalanche/ansible-avalanche-getting-started#48