On deployment-logstash03.deployment-prep.eqiad.wmflabs the last Puppet run was at Mon May 17 14:59:36 UTC 2021.
/var/log/puppet.log has:
Could not retrieve catalog from remote server: Error 500 on SERVER: Server Error: Evaluation Error: Error while evaluating a Resource Statement, Evaluation Error: Operator '[]' is not applicable to an Undef Value. (file: /etc/puppet/modules/confluent/manifests/kafka/broker.pp, line: 332, column: 11) on node deployment-logstash03.deployment-prep.eqiad.wmflabs
That corresponds to this expression:
$id = $brokers[$::fqdn]['id']
So $brokers is probably undefined.