Sources describe how events enter a Timestream. Every source is a Timestream containing the events that have been read. Most often, these events are records.

Each event from a source is associated with a specific time and entity key. These define how the resulting Timestream is ordered and grouped. Generally, the time and entity key are associated with a specific column from the source, using the time_column and key_column arguments.

The Sources Reference has more details on the supported sources.