Added documentation for telemetry section (open-telemetry#1211)

Author: TylerHelmuth

content/en/docs/collector/configuration.md

@@ -379,10 +379,11 @@ The service section is used to configure what components are enabled in the
 Collector based on the configuration found in the receivers, processors,
 exporters, and extensions sections. If a component is configured, but not
 defined within the service section then it is not enabled. The service section
-consists of two sub-sections:
+consists of three sub-sections:
 
 - extensions
 - pipelines
+- telemetry
 
 Extensions consist of a list of all extensions to enable. For example:
 
@@ -422,6 +423,26 @@ service:
       exporters: [opencensus, zipkin]
 ```
 
+Telemetry is where the telemetry for the collector itself can be configured.  It has two subsections: `logs` and `metrics`.
+
+The `logs` subsection allows configuration of the logs generated by the collector.  By default the collector will write its logs to stderr with a log level of `INFO`.  You can also add static key-value pairs to all logs using the `initial_fields` section.  [View the full list of `logs` options here.](https://github.com/open-telemetry/opentelemetry-collector/blob/7666eb04c30e5cfd750db9969fe507562598f0ae/config/service.go#L41-L97)
+
+The `metrics` subsection allows configuration of the metrics generated by the collector.  By default the collector will generate basic metrics about itself and expose them for scraping at `localhost:8888/metrics`  [View the full list of `metrics` options here.](https://github.com/open-telemetry/opentelemetry-collector/blob/7666eb04c30e5cfd750db9969fe507562598f0ae/config/service.go#L99-L111)
+
+The following is an example telemetry configuration:
+
+```yaml
+service:
+  telemetry:
+    logs:
+      level: debug
+      initial_fields:
+        service: my-instance
+    metrics:
+      level: detailed
+      address: 0.0.0.0:8888
+```
+
 ## Other Information
 
 ### Configuration Environment Variables