Backport:

Backport:

  *) mpm_event: Restart stopping of idle children after a load peak. PR 65626.
     trunk patch: http://svn.apache.org/r1894285
                  http://svn.apache.org/r1894286
                  http://svn.apache.org/r1894291
                  http://svn.apache.org/r1895550
                  http://svn.apache.org/r1895553
                  http://svn.apache.org/r1895630
     backport PR: https://github.com/apache/httpd/pull/276
     2.4.x patch: https://patch-diff.githubusercontent.com/raw/apache/httpd/pull/276.patch
     +1: ylavic, rpluem, minfrin
     ylavic: updated with r1894291 for correctness of perform_idle_server_maintenance()
             w.r.t. num_buckets > 1 and ease merging of r1895553, with r1895550 for
             correctness of active_daemons used in r1895553 and r1895630.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1895871 13f79535-47bb-0310-9956-ffa450edef68