docs: Call out that xprofile is not intended for production

Change-Id: I1e9d4d5df403040d69db93a08647cd0abe1b8037

etc/account-server.conf-sample

@@ -297,7 +297,8 @@ use = egg:swift#backend_ratelimit
 # ionice_priority =
 
 # Note: Put it at the beginning of the pipeline to profile all middleware. But
-# it is safer to put this after healthcheck.
+# it is safer to put this after healthcheck. Not intended for production
+# environments!
 [filter:xprofile]
 use = egg:swift#xprofile
 # This option enable you to switch profilers which should inherit from python

etc/container-server.conf-sample

@@ -339,7 +339,8 @@ use = egg:swift#backend_ratelimit
 # ionice_priority =
 
 # Note: Put it at the beginning of the pipeline to profile all middleware. But
-# it is safer to put this after healthcheck.
+# it is safer to put this after healthcheck. Not intended for production
+# environments!
 [filter:xprofile]
 use = egg:swift#xprofile
 # This option enable you to switch profilers which should inherit from python

etc/object-server.conf-sample

@@ -728,10 +728,11 @@ use = egg:swift#backend_ratelimit
 # N.B. By default no delay_reaping value is configured for any accounts or
 # containers.
 
+# Note: Put it at the beginning of the pipleline to profile all middleware. But
+# it is safer to put this after healthcheck. Not intended for production
+# environments!
 [filter:xprofile]
 use = egg:swift#xprofile
-# Note: Put it at the beginning of the pipleline to profile all middleware. But
-# it is safer to put this after healthcheck.
 # This option enable you to switch profilers which should inherit from python
 # standard profiler. Currently the supported value can be 'cProfile',
 # 'eventlet.green.profile' etc.

etc/proxy-server.conf-sample

@@ -1169,6 +1169,7 @@ use = egg:swift#container_sync
 
 # Note: Put it at the beginning of the pipeline to profile all middleware. But
 # it is safer to put this after catch_errors, gatekeeper and healthcheck.
+# Not intended for production environments!
 [filter:xprofile]
 use = egg:swift#xprofile
 # This option enable you to switch profilers which should inherit from python

swift/common/middleware/xprofile.py

@@ -16,6 +16,11 @@
 """
 Profiling middleware for Swift Servers.
 
+.. note::
+    This middleware is intended for development and testing environments only,
+    not production. No authentication is expected or required for the web UI,
+    and profiling may incur noticeable performance penalties.
+
 The current implementation is based on eventlet aware profiler.(For the
 future, more profilers could be added in to collect more data for analysis.)
 Profiling all incoming requests and accumulating cpu timing statistics