grafana: Add requests to aurweb dashboard

• Add timeseries visualizations for number of requests by status and type.
• Convert graph vis. types to timeseries for Users and Packages.
  (graph is deprecated)

added 5 commits

• 55d31bb9...b8a4afa7 - 4 commits from branch archlinux:master
• 39628593 - grafana: Add requests to aurweb dashboard

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added 4 commits

• 39628593...404f8b3a - 3 commits from branch archlinux:master
• 4d2f5b2f - grafana: Add requests to aurweb dashboard

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added 2 commits

• 8e6d5474 - 1 commit from branch archlinux:master
• 1b666015 - grafana: Add requests to aurweb dashboard

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mentioned in commit 4bfd6e2a

merged