TS-3036 Add "chm" to the docs.

Project: http://git-wip-us.apache.org/repos/asf/trafficserver/repo
Commit: http://git-wip-us.apache.org/repos/asf/trafficserver/commit/2660e4ce
Tree: http://git-wip-us.apache.org/repos/asf/trafficserver/tree/2660e4ce
Diff: http://git-wip-us.apache.org/repos/asf/trafficserver/diff/2660e4ce

Branch: refs/heads/master
Commit: 2660e4ceda0899e429d792512aa19bf7b6868827
Parents: 90f9a5c
Author: Leif Hedstrom <[email protected]>
Authored: Mon Mar 9 18:03:00 2015 -0600
Committer: Leif Hedstrom <[email protected]>
Committed: Mon Mar 9 18:03:00 2015 -0600

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 doc/admin/event-logging-formats.en.rst | 9 +++++++++
 1 file changed, 9 insertions(+)
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http://git-wip-us.apache.org/repos/asf/trafficserver/blob/2660e4ce/doc/admin/event-logging-formats.en.rst
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diff --git a/doc/admin/event-logging-formats.en.rst 
b/doc/admin/event-logging-formats.en.rst
index bd70702..0e658db 100644
--- a/doc/admin/event-logging-formats.en.rst
+++ b/doc/admin/event-logging-formats.en.rst
@@ -252,6 +252,15 @@ The following list describes Traffic Server custom logging 
fields.
     The cache result code; specifies how the cache responded to the
     request (``HIT``, ``MISS``, and so on).
 
+.. _chm:
+
+``chm``
+    The cache hit-miss status, specifying which level of the cache this
+    was served out of. This is useful for example to show whether it was a
+    RAM cache vs disk cache hit. Future versions of the cache will support
+    more levels, but right now it only supports RAM (``HIT_RAM``) vs
+    rotational disk (``HIT_DISK``).
+
 .. _csscl:
 
 ``csscl``

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