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I have a handful of orphan data sources that the poller uses and logs errors on because they are invalid. In searching the GUI, I cannot find the DSs, I have the search criteria set to "all" and "orphan" selected and they do not show up. I also deleted and re-created the device and the invisible orphans were not deleted.
In this case, the data source has the ID: 2897, more importantly the device has the ID: 426, looks like it's a Non-SNMP device, yet you've added a bunch of SNMP level graphs. Just delete them.
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