In trying to resolve INFRA-1024, I ended up overwriting a credential used for the "reindex_maven" job. AFAIK only Daniel has the key for this, and I need him to upload this secret once again. My bad.
Wasn't me – Tyler set up this job when he established trusted.ci. I don't have the password for the index-generator user. I just set up build rotation when I edited this job.
Regenerated the password for the repository-index-generator user in Artifactory and changed the job to use a "Secret File" since it needn't use a full .zip file for just one secret value.