Update profiler configuration with redis backend

Change-Id: If961adee875699c5cb07f90951064b9701c52642

doc/source/contributor/profiler-config.rst

@@ -15,17 +15,18 @@ Configuration
 
 Profiling must be enabled **explicitly** in Vitrage configuration file::
 
-
     [profiler]
 
     enabled = true
     hmac_keys = SECRET_KEY
-    #connection_string = messaging://
+    connection_string = redis://<ip-address>:6379/
 
 - ``hmac_key`` will be used in client to sign a request with profiling enabled
-- ``connection_string`` specify the storage driver to collect tracing data, default to ceilometer via messaging
+- ``connection_string`` specify the storage driver to collect tracing data, fill in real IP address of redis here.
 
-Please refer to `osprofiler user manual`_ for details
+Note: in devstack environment, redis is available on ``redis://127.0.0.1:6379``.
+
+Please refer to `osprofiler user manual`_ for details.
 
 .. _osprofiler user manual: https://docs.openstack.org/osprofiler/latest/user/index.html
 
@@ -38,11 +39,7 @@ Use ``--profile`` option in Vitrage CLI to send a request with profiling enabled
 
 The key must match the `hmac_keys` configured in the server.
 
-The uuid of trace will be prepended to the result::
-
-    To display trace use the command:
-
-      osprofiler trace show --html 8c2a594b-bb26-4a00-a408-fd378ae3566b
+The uuid of trace will be prompted in console after the normal result. For example::
 
     {
       "directed": true,
@@ -50,11 +47,15 @@ The uuid of trace will be prepended to the result::
       "nodes": [],
       "links": [],
       "multigraph": true
-    }%
+    }
+
+    To display trace use the command:
+
+      osprofiler trace show --html 8c2a594b-bb26-4a00-a408-fd378ae3566b
 
 Follow the help message above to show the trace file with ``osprofiler`` client::
 
-    osprofiler trace show --html 8c2a594b-bb26-4a00-a408-fd378ae3566b
+    osprofiler trace show --html <TRACE-ID> --connection-string=redis://<ip-address>:6379
 
 .. image:: ./images/osprofiler-html-output.png
    :width: 100%