Book: Configuration guide
Revision: n_2306591_configuration-guide_version_7.0_edition_1.0_release_0-revision_9024501
Issue description: There is no link or even description of request-controller subsystem in graceful shutdown section.
Suggestion for improvement: Add a description of request-controller subsystem, for what it can be used etc. to guide or add a note about it to graceful shutdown section.