We found something really odd with Zenoss 6.2.1 (Community). We have a custom zenpack with a modeler plugin. It runs fine if only one datasource is enabled, but things go crazy if 2+ datasources are enabled. It randomly has multiple runs (collections) within the collection interval. And....it causes other zenpacks (e.g. Windows) to do the same (have multiple collections inside one collection interval). Each data point is unique (often with a different value), so that confirms Zenoss isn't collecting ONCE and writing it multiple times. Instead, it's COLLECTING multiple times. We are using the default collection interval of 300 seconds. We tried changing the collection interval for our custom zenpack to 900 seconds, but it didn't have an impact.