As part of the migration to zuul v3, a few of the links have changed.
In particular:
- The periodic job failure rate in grafana is now panel 6, not 4.
- The periodic logs are no longer in a single location and thus
can't be referenced with a single link.
This patch fixes up those issues.
Change-Id: Ifb60cebab4b9a2e61a15f21f9cb4fc13d52975ee
0996b3fc02