Logging
There are four places to see log information, two of which you can write to from your Flows.
Execution History Log
This is written to during Flow execution when using the Editor. This information is also stored in the Execution History, if enabled.
This is shown in the lower right pane of the Flow editor.
Alert Log
Logging information generated by system and JS BLock used-generated alerts.
Refer to Alerts for a detailed explanation.
Console Log
This is reserved for use by your Flows and appears in the bottom left pane of the Flow editor.
You write to this from a Javascript Block using consoleMsg(), which behaves like a regular console.log() statement.
System Log
You can also write to the system log files, which are stored in the volume-data/logs folder.
Log viewer
There is a System Log Viewer in the Global Settings.
Write to log from Javascript Block
Write to system logs using sysLog.(log|warn|debug|verbose|error). See the Javascript Block for details.