I noticed that 2 of our nodes dropped from the cluster. Ping health check of the nodes return healthy (/PRRestService/monitor/pingservice/ping) but the /api/CloudRemoteAPI/v1/pznodes returns error. These nodes don't show in admin studio either.

"error": [         {             "errorMessage": "Exception happened at remote node 42b3e06422bf5cb79831681377acf9a4, error: null",             "nodeId": "42b3e06422bf5cb79831681377acf9a4"         },         {             "errorMessage": "Exception happened at remote node 7612d1788f13c857a8780a32d849fd9d, error: null",             "nodeId": "7612d1788f13c857a8780a32d849fd9d"         }     ],     "status": 207,

There is nothing in cluster logs. Is there anything I can look for in pega logs or api calls to see what is the root cause? How can I add these nodes back into cluster without restarting?