Monitoring and troubleshooting hybrid search is difficult and near impossible. Can we get more visibility into the hybrid connection and try to answer some of these questions?
1) How many items are in my O365 index, internal vs external? Did you know there's a 1M items from an external search limit per 1TB of SPO storage? Am I close? How much do I have now?
2) Why aren't my items showing up in the cloud search? Is this farm connected? When was the last successful push? What else might I need to know to fix this?
3) Can I remove orphaned items? Currently have to submit a support ticket