Add opentracing-operation-name and opentracing-location-operation-name config settings

With these settings custom span names can be used for the server span and location span

Signed-off-by: Jorrit Salverda <jsalverda@travix.com>

docs/user-guide/nginx-configuration/configmap.md

@@ -115,6 +115,8 @@ The following table shows a configuration option's name, type, and the default v
 |[proxy-add-original-uri-header](#proxy-add-original-uri-header)|bool|"true"|
 |[generate-request-id](#generate-request-id)|bool|"true"|
 |[enable-opentracing](#enable-opentracing)|bool|"false"|
+|[opentracing-operation-name](#opentracing-operation-name)|string|""|
+|[opentracing-location-operation-name](#opentracing-location-operation-name)|string|""|
 |[zipkin-collector-host](#zipkin-collector-host)|string|""|
 |[zipkin-collector-port](#zipkin-collector-port)|int|9411|
 |[zipkin-service-name](#zipkin-service-name)|string|"nginx"|
@@ -700,6 +702,18 @@ Enables the nginx Opentracing extension. _**default:**_ is disabled
 _References:_
 [https://github.com/opentracing-contrib/nginx-opentracing](https://github.com/opentracing-contrib/nginx-opentracing)
 
+## opentracing-operation-name
+
+Specifies a custom name for the server span. _**default:**_ is empty
+
+For example, set to "HTTP $request_method $uri".
+
+## opentracing-location-operation-name
+
+Specifies a custom name for the location span. _**default:**_ is empty
+
+For example, set to "HTTP $request_method $uri".
+
 ## zipkin-collector-host
 
 Specifies the host to use when uploading traces. It must be a valid URL.

docs/user-guide/third-party-addons/opentracing.md

@@ -30,6 +30,12 @@ have been tested.
 
 Other optional configuration options:
 ```
+# specifies the name to use for the server span
+opentracing-operation-name
+
+# specifies specifies the name to use for the location span
+opentracing-location-operation-name
+
 # specifies the port to use when uploading traces, Default: 9411
 zipkin-collector-port