Viewing Logs

You can view your app logs in Plotly Cloud by going to your app Settings . In the Revisions & logs tab, build logs and runtime logs are displayed for your latest app revision.

To view historical build and runtime logs, select an older revision from the History.

Logs are ordered top-to-bottom (most recent logs last).

Logs are available in Plotly Cloud for approximately 7 days after they were last emitted. We recommend downloading them if you need to reference them for a longer period of time.

Build logs

Build logs represent statements emitted by Plotly Cloud when it builds your app. You'll see lines for Plotly Cloud using your selected Python version, installing your app dependencies, and more.

If you did not upload a file specifying your app dependencies, Plotly Cloud identifies them and installs the latest versions. You'll see logs similar to the following:

Dependencies identified:
dash
numpy
plotly
pandas
...
were found and will be installed. To provide your own dependencies, specify a requirements.txt or pyproject.toml.
...

Build logs can help you troubleshoot an app in the Build Failed status.

Runtime logs

Runtime logs represent statements emitted by Plotly Cloud when it starts and stops running your app, as well as anything that your app prints while it's running.

Info

All apps that are successfully published and running on Plotly Cloud have a line Starting gunicorn in their runtime logs. Gunicorn is the WSGI HTTP server that Plotly Cloud uses internally.

Runtime logs can help you troubleshoot an app in the Failing status.