itsp/devmode/contextdump is a SAP Parameter attribute which is used to control Integrierter ITS, HTML Kontextdump erlauben information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
If this parameter is activated, the HTML context dump (diagnosis output
of the variables on the HTML page stored in the ITS context) can be
activated for all ITS services using the URL parameter ~record=1. The
contents of the context variables can be security-relevant.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.