documentation example missing admin user requirement

[andrasbabos]

Hello!

Please can you mention in the examples that it is mandatory to define the admin user and password variables.

This is the error with the default values:

TASK [cloudalchemy.grafana : Fail when grafana admin password isn't set] ******************************************************************************************************************************************************************
fatal: [grafana.vlab.lcl]: FAILED! => {"changed": false, "msg": "Please specify grafana admin password (grafana_security.admin_password)"}
	to retry, use: --limit @/home/andrasb/playbooks/vlab.retry

After I defined group vars it worked fine:

---
grafana_security:
  admin_user: admin
  admin_password: "myverysecurepassword"

Thank you in advance!

[paulfantom]

I am happy to review and accept PRs ;)

[andrasbabos]

Thanks, I will send PR :)

[lock]

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