During Load Balancing process, if there is a failure on:

https://github.com/Azure/azure-cosmos-dotnet-v3/blob/master/Microsoft.Azure.Cosmos/src/ChangeFeedProcessor/FeedManagement/PartitionLoadBalancerCore.cs#L80-L81

It is not registered on the Notifications API.

In order to include these failures, the PartitionLoadBalancerCore needs to receive in its constructor, the ChangeFeedProcessorHealthMonitor , like https://github.com/Azure/azure-cosmos-dotnet-v3/blob/master/Microsoft.Azure.Cosmos/src/ChangeFeedProcessor/FeedManagement/PartitionControllerCore.cs#L34.

With the monitor, we can then log any issue on https://github.com/Azure/azure-cosmos-dotnet-v3/blob/master/Microsoft.Azure.Cosmos/src/ChangeFeedProcessor/FeedManagement/PartitionLoadBalancerCore.cs#L96-L100

catch (Exception e)
{
	Extensions.TraceException(e);
	DefaultTrace.TraceError("Partition load balancer iteration failed");
	await this.monitor.NotifyErrorAsync("Partition load balancer", e);
}