renew_attestations uses a lot of CPU

[richvdh]

I had to slow it down on matrix.org: 14bb4cf. We should probably make that permanent

[richvdh]

release blocker because it's important for matrix.org

[clokep]

(This seems to partially revert #7344.)

[richvdh]

(This seems to partially revert #7344.)

yes, it removes the magic needed for tracking logcontexts across parallel jobs, because we no longer run the jobs in parallel.

[anoadragon453]

With #7411 merged, I believe this can be closed.

[richvdh]

With #7411 merged, I believe this can be closed.

itym #7442

[richvdh]

this was basically a dup of #5936