Recently I found out the problem with this. it is a simple issue to fix but if you don't know it it would drive you crazy, at least it did for me. If the object on your map is always red even it is completely healthy, i went to SETTING and drilled down the server in question. I saw a NIC and a Volume that are no longer existed on the server any more. I just deleted these ghost drive and NIC and a few minutes later the monitored server no longer give me false unhealthy state on the map. and to be safe i manually rescanned the server to make sure everything matched up.
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