draw.io is becoming diagrams.net

1. As an administrator, click on the gear icon and select General configuration to go to your Confluence Server instance's settings. 
2. Under the Administration section in the left panel, click on Logging and Profiling.
3. Add a new entry with the text com.mxgraph, select “ALL” from the Level drop down list, then click Add entry.

Disable additional debugging

1. As an administrator, click on the gear icon and select General configuration.
2. Under the Administration section in the left panel, click on Logging and Profiling.
3. Click the Remove link next to the com.mxgraph entry.