I have an idea on how the logs from the start and the end of pipelines could be displayed. I would propose to show these under the 'Start' and 'End' nodes.
So under 'Start':

• All logs that happen before any step (fetching libraries etc)
• All steps that happen before any stage

And under 'End':

• All steps that happen after any stage
• All logs that happen after the pipeline itself (usually plugins which do automatic stuff)