Allow optionally configuring git-annex with -fEKG to enable awesome remote monitoring interfaceat http://localhost:4242/

doc/ekg.mdwn

@@ -0,0 +1,14 @@
+You can `cabal configure -fEKG` to build a git-annex that includes
+the EKG remote monitoring interface.
+
+To access the EKG control panel, go to
+<http://localhost:4242/> while a git-annex command is running.
+
+This EKG build is mostly useful for debugging resource usage problems.
+
+[[!img ekg.png caption="git-annex webapp startup, and assistant startup scan"]]
+
+Note that since only one process can open port 4242 at a time, running
+more than one git-annex process with EKG support at the same time can
+result in some "resource busy (Address already in use)" messages -- but
+git-annex will continue to work.

doc/install/cabal.mdwn

@@ -50,3 +50,9 @@ you want, and use cabal as follows inside its source tree:
 	cabal configure
 	cabal build
 	cabal install --bindir=$HOME/bin
+
+## EKG
+
+When building with cabal, you can optionally enable the 
+[[EKG monitoring interface|ekg]]. This is great for debugging resource
+usage problems.