#920 Add README.

plugins/inputs/uwsgi/README.md

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+# uWSGI
+
+The uWSGI gathers metrics about uWSGI using its [Stats Server][stats_server].
+
+### Configuration
+
+```toml
+[[inputs.uwsgi]]
+    ## List with urls of uWSGI Stats servers. Url must match pattern:
+    ## scheme://address[:port]
+    ##
+    ## For example:
+    ## servers = ["tcp://localhost:5050", "http://localhost:1717", "unix:///tmp/statsock"]
+    servers = []
+```
+
+### Measurements and fields
+
+- uwsgi_overview
+    - listen_queue
+    - listen_queue_errors
+    - load
+    - signal_queue
+
+- uwsgi_workers
+    - requests
+    - accepting
+    - delta_request
+    - exceptions
+    - harakiri_count
+    - signals
+    - signal_queue
+    - status
+    - rss
+    - vsz
+    - running_time
+    - last_spawn
+    - respawn_count
+    - tx
+    - avg_rt
+
+- uwsgi_apps
+    - modifier1
+    - requests
+    - startup_time
+    - exceptions
+
+- uwsgi_cores
+    - requests
+    - static_requests
+    - routed_requests
+    - offloaded_requests
+    - write_errors
+    - read_errors
+    - in_request
+
+###  Tags
+
+- uwsgi_overview
+    - url
+    - pid
+    - uid
+    - gid
+    - version
+    - cwd
+
+- uwsgi_workers
+    - worker_id
+    - url
+    - pid
+
+- uwsgi_apps
+    - app_id
+    - worker_id
+    - mount_point
+    - chdir
+
+- uwsgi_cores
+    - core_id
+    - worker_id
+
+### Example Output:
+
+```
+* Plugin: uwsgi, Collection 1
+> uwsgi_overview,cwd=/tmp/uwsgi,gid=1000,pid=5347,uid=1000,url=tcp://localhost:5050,version=2.0.12 listen_queue=0i,listen_queue_errors=0i,load=0i,signal_queue=0i 1460660786056661209
+> uwsgi_workers,pid=5350,url=tcp://localhost:5050,worker_id=1 accepting=1i,avg_rt=0i,delta_request=0i,exceptions=0i,harakiri_count=0i,last_spawn=1460660781i,requests=0i,respawn_count=1i,rss=0i,running_time=0i,signal_queue=0i,signals=0i,status="idle",tx=0i,vsz=0i 1460660786056861579
+> uwsgi_apps,app_id=0,worker_id=1 exceptions=0i,modifier1=0i,requests=0i,startup_time=0i 1460660786057015120
+> uwsgi_cores,core_id=0,worker_id=1 in_request=0i,offloaded_requests=0i,read_errors=0i,requests=0i,routed_requests=0i,static_requests=0i,write_errors=0i 1460660786057186673
+```
+
+[stats_server]: http://uwsgi-docs.readthedocs.org/en/latest/StatsServer.html