rebuilderd prometheus-exporter: use new /dashboard endpoint

A diff between the old and the new output (diff old new):

3a4
> rebuilderd_results{suite="community",status="unknown"} 0
5a7
> rebuilderd_results{suite="core",status="unknown"} 0
8c10
< rebuilderd_results{suite="extra",status="unkwn"} 2
---
> rebuilderd_results{suite="extra",status="unknown"} 2
10a13
> rebuilderd_results{suite="testing",status="unknown"} 0

approved this merge request

approved this merge request

added 9 commits

• 6241f159...d058dc18 - 8 commits from branch archlinux:master
• dd6ac87c - rebuilderd prometheus-exporter: use new /dashboard endpoint

Compare with previous version

merged

mentioned in commit 71756cf9