The SAP Logging Connector allows a Mendix app to output logs in a format supported by the Kibana dashboard provided by the SAP Cloud Platform Application Logging service. Without this connector, logs sent to Kibana will not have the correct structure and log level.
By using this connector, logs will be output in a JSON format with the following fields:
msg- the actual log message
level- the log level
written_at- the log timestamp as reported by the Mendix app
written_ts- the log timestamp which can be used for ordering the logs
stacktrace- the stack trace attached to the log message (if it exists)
In addition, the Connector supports multiline log messages.
2 Getting the SAP Logging Connector
3 Using the Connector
To format all the log messages, the SAP Logging Connector needs to be initialized during the startup of the Mendix application.
To initialize the connector, do the following:
Open Project … > Settings in the Project Explorer:
Switch to the Runtime tab.
Go to the After startup microflow by clicking Show next to the After startup microflow:
If there’s no existing microflow (as indicated by the text
(none), instead of a microflow name), click Select… and create a new microflow by clicking New:
Drag and drop the RegisterSubscriber action at the end of the After startup microflow:
Double-click the RegisterSubscriber action make sure that Log level is set to the constant SapLogLevel:
Edit the constant SapLogLevel to select the minimum log level which you want to send to the SAP Cloud Platform Application Logging service. The supported log levels (case-insensitive) are
Now, when the application is started, it will produce logs in the JSON format supported by Kibana.
- Due to technical limitations, the SAP Logging Connector is activated with a 5 second delay. This means that logging configuration is updated after the RegisterSubscriber action is completed.
- The RegisterSubscriber action checks to see if the Mendix application is running in an SAP environment with the SAP Cloud Platform Application Logging service. If the SAP Cloud Platform Application Logging service cannot be found, RegisterSubscriber assumes that the app is running locally and doesn’t change the logging configuration.
- When log messages are generated rapidly, it is possible that Kibana will display them in the wrong order. The
written_atfield can be used to sort the log messages.