add service/cluster-not-found count to simple load balancer jmx. And add entry-out-of-sync count to dual read monitoring. #936
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Background
We had issues where Observer accidentally deleted all cluster properties, but we weren't able to see that the client is failing to get clusters on any ingraph metric but only via digging into logs.
For dual read, we've been only monitoring when the data is mismatched, but not when data is received on side (like ZK) but not on the other side (like xDS).
Changes