It turns out this was an ID10T error. One of my puppet masters inadvertently got upgraded, including the puppetserver and puppetdb-termini RPMs. The problem went away when I reverted the puppet RPMs back to their previous release. From what I could tell, the newer puppetserver/puppetdb-termini was sending data to the puppetdb, who did not appreciate the format. Classic error of using two versions of softwares not intended to be used with each other.
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