diff --git src/main/docbkx/ops_mgt.xml src/main/docbkx/ops_mgt.xml
index 21045bd..a17a1a2 100644
--- src/main/docbkx/ops_mgt.xml
+++ src/main/docbkx/ops_mgt.xml
@@ -1065,6 +1065,34 @@ $ for i in `cat conf/regionservers|sort`; do ./bin/graceful_stop.sh --restart --
+
+ Units of Measure for Metrics
+ Different metrics are expressed in different units, as appropriate. Often, the unit of
+ measure is in the name (as in the metric shippedKBs). Otherwise, use the
+ following guidelines. When in doubt, you may need to examine the source for a given
+ metric.
+
+
+ Metrics that refer to a point in time are usually expressed as a timestamp.
+
+
+ Metrics that refer to an age (such as ageOfLastShippedOp) are usually
+ expressed in milliseconds.
+
+
+ Metrics that refer to memory sizes are in bytes.
+
+
+ Sizes of queues (such as sizeOfLogQueue) are expressed as the number of
+ items in the queue. Determine the size by multiplying by the block size (default is 64
+ MB in HDFS).
+
+
+ Metrics that refer to things like the number of a given type of operations (such as
+ logEditsRead) are expressed as an integer.
+
+
+
Most Important RegionServer Metrics
Previously, this section contained a list of the most important RegionServer metrics.