Yes i do - all indices are present and fresh at the monitoring cluster. I think i got hit by this bug: Upgrade 7.6->7.7 unable to verify the first certificate"
However, my Cluster is running in docker swarm, the suggested workaround to pipe the certificate directly into the kibana.yaml does not work with this setup. And yes, we are using metricbeat to gather metrics from kibana, elasticsearch and logstash.