Importing this repository:
https://gerrit.wikimedia.org/r/p/operations/puppet
...leaves about 10 commits missing the "Herald" step; these include:
```
rOPUP4cbebb710ebbb84ea608ae78a4b77f08e2d31780
rOPUP5370107635ef0685368535710eda866fe930735a
rOPUPaa5af1ee3a52e37498efa902ca5ae2810312d990
rOPUP45071cbbad9760eef69d117630128cce2b45e890
rOPUPfd5273a5fdbf6766b386a90a983fe4b7ab44b9e0
rOPUP586b07329677b9aa7ee9268b8641e84a480def4e
rOPUPebcb7cd844d8ed68245dacd127cc7af979f94aa3
rOPUP69f3b4ec4c0c091f3b4aafb4c031bd998258beaf
```
Re-running the message/change/owners/herald steps on these commits imports them without any issues, though, and the daemon logs aren't showing anything useful.
One thing that these commits share is that they're all mentioned later by other commits, so I suspect that may be a clue.