A method, non-transitory computer readable medium, and data manager computing device comprises retrieving a time series data of a monitored asset based on one or more tags in response to a request. Further, a heterogeneous data based on the one or more tags is retrieved. Furthermore, a cause of an anomaly period in retrieved time series data of the monitored asset is determined based on the retrieved heterogeneous data. Finally, the determined cause of the anomaly period in the time series data in the monitored asset is provided.