doc: add $pid metavar conf doc

$pid introduced in 2012 via cf2a0454.

Signed-off-by: Patrick Donnelly <pdonnell@redhat.com>

diff --git a/doc/rados/configuration/ceph-conf.rst b/doc/rados/configuration/ceph-conf.rst
index 63edabaac3ba10cdb97aff5cec392584837e46b9..a5e0c6c1b78422f02c3ffd731a24b6ceb3500c6b 100644 (file)
--- a/doc/rados/configuration/ceph-conf.rst
+++ b/doc/rados/configuration/ceph-conf.rst
@@ -227,6 +227,11 @@ Ceph supports the following metavariables:
 :Description: Expands to ``$type.$id``.
 :Example: ``/var/run/ceph/$cluster-$name.asok``
 
+``$pid``
+
+:Description: Expands to daemon pid.
+:Example: ``/var/run/ceph/$cluster-$name-$pid.asok``
+
 
 .. _ceph-conf-common-settings: