Fix existing markdown lint issues (#1866)

* Remove empty sdk README

* Fix markdown lint issues

* Update markdownlint config to ignore single title header

* Remove broken link

.markdownlint.yaml

@@ -14,6 +14,9 @@ MD013: false
 MD024:
   siblings_only: true
 
+#single-title
+MD025: false
+
 # ol-prefix
 MD029:
   style: ordered

bridge/opencensus/README.md

@@ -54,6 +54,7 @@ Starting from an application using entirely OpenCensus APIs:
 4. Remove OpenCensus exporters and configuration
 
 To override OpenCensus' DefaultTracer with the bridge:
+
 ```go
 import (
 	octrace "go.opencensus.io/trace"
@@ -102,6 +103,7 @@ Starting from an application using entirely OpenCensus APIs:
 4. Remove OpenCensus Exporters and configuration.
 
 For example, to swap out the OpenCensus logging exporter for the OpenTelemetry stdout exporter:
+
 ```go
 import (
 	"go.opencensus.io/metric/metricexport"

example/otel-collector/README.md

@@ -12,6 +12,7 @@ App + SDK ---> OpenTelemetry Collector ---|
 ```
 
 # Prerequisites
+
 You will need access to a Kubernetes cluster for this demo. We use a local
 instance of [microk8s](https://microk8s.io/), but please feel free to pick
 your favorite. If you do decide to use microk8s, please ensure that dns
@@ -30,6 +31,7 @@ kubernetes cluster, or use a secured connection (NodePort/LoadBalancer with TLS
 or an ingress extension).
 
 # Deploying to Kubernetes
+
 All the necessary Kubernetes deployment files are available in this demo, in the
 [k8s](./k8s) folder. For your convenience, we assembled a [makefile](./Makefile)
 with deployment commands (see below). For those with subtly different systems,
@@ -39,14 +41,18 @@ Makefile will not recognize the alias, and so the commands will have to be run
 manually.
 
 ## Setting up the Prometheus operator
+
 If you're using microk8s like us, simply do
+
 ```bash
 microk8s enable prometheus
 ```
+
 and you're good to go. Move on to [Using the makefile](#using-the-makefile).
 
 Otherwise, obtain a copy of the Prometheus Operator stack from
 [coreos](https://github.com/coreos/kube-prometheus):
+
 ```bash
 git clone https://github.com/coreos/kube-prometheus.git
 cd kube-prometheus
@@ -57,11 +63,13 @@ kubectl create -f manifests/
 ```
 
 And to tear down the stack when you're finished:
+
 ```bash
 kubectl delete --ignore-not-found=true -f manifests/ -f manifests/setup
 ```
 
 ## Using the makefile
+
 Next, we can deploy our Jaeger instance, Prometheus monitor, and Collector
 using the [makefile](./Makefile).
 
@@ -94,6 +102,7 @@ kubectl delete namespaces observability
 ```
 
 # Configuring the OpenTelemetry Collector
+
 Although the above steps should deploy and configure everything, let's spend
 some time on the [configuration](./k8s/otel-collector.yaml) of the Collector.
 
@@ -133,6 +142,7 @@ need to create the Jaeger and Prometheus exporters:
 ## OpenTelemetry Collector service
 
 One more aspect in the OpenTelemetry Collector [configuration](./k8s/otel-collector.yaml) worth looking at is the NodePort service used for accessing it:
+
 ```yaml
 apiVersion: v1
 kind: Service
@@ -157,8 +167,8 @@ spec:
 
 This service will bind the `55680` port used to access the otlp receiver to port `30080` on your cluster's node. By doing so, it makes it possible for us to access the Collector by using the static address `<node-ip>:30080`. In case you are running a local cluster, this will be `localhost:30080`. Note that you can also change this to a LoadBalancer or have an ingress extension for accessing the service.
 
-
 # Running the code
+
 You can find the complete code for this example in the [main.go](./main.go)
 file. To run it, ensure you have a somewhat recent version of Go (preferably >=
 1.13) and do
@@ -171,10 +181,12 @@ The example simulates an application, hard at work, computing for ten seconds
 then finishing.
 
 # Viewing instrumentation data
+
 Now the exciting part! Let's check out the telemetry data generated by our
 sample application
 
 ## Jaeger UI
+
 First, we need to enable an ingress provider. If you've been using microk8s,
 do
 
@@ -183,20 +195,24 @@ microk8s enable ingress
 ```
 
 Then find out where the Jaeger console is living:
+
 ```bash
 kubectl get ingress --all-namespaces
 ```
 
 For us, we get the output
+
 ```
 NAMESPACE       NAME           CLASS    HOSTS   ADDRESS     PORTS   AGE
 observability   jaeger-query   <none>   *       127.0.0.1   80      5h40m
 ```
+
 indicating that the Jaeger UI is available at
 [http://localhost:80](http://localhost:80). Navigate there in your favorite
 web-browser to view the generated traces.
 
 ## Prometheus
+
 Unfortunately, the Prometheus operator doesn't provide a convenient
 out-of-the-box ingress route for us to use, so we'll use port-forwarding
 instead. Note: this is a quick-and-dirty solution for the sake of example.

example/prom-collector/README.md

@@ -1,3 +1,5 @@
+# Prometheus Collector Example
+
 This example demonstrates a metrics export pipeline that supports
 Prometheus (pull) and simultaneously exports OTLP to an OpenTelemetry
 endpoint (push).

example/zipkin/README.md

@@ -4,19 +4,21 @@ Send an example span to a [Zipkin](https://zipkin.io/) service.
 These instructions expect you have [docker-compose](https://docs.docker.com/compose/) installed.
 
 Bring up the `zipkin-collector` service and example `zipkin-client` service to send an example trace:
+
 ```sh
 docker-compose up --detach zipkin-collector zipkin-client
 ```
 
 The `zipkin-client` service sends just one trace and exits. Retrieve the `traceId` generated by the `zipkin-client` service; should be the last line in the logs:
+
 ```sh
 docker-compose logs --tail=1 zipkin-client
 ```
 
-With the `traceId` you can view the trace from the `zipkin-collector` service UI hosted on port `9411`, e.g. with `traceId` of `f5695ba3b2ed00ea583fa4fa0badbeef`:
+With the `traceId` you can view the trace from the `zipkin-collector` service UI hosted on port `9411`, e.g. with `traceId` of `f5695ba3b2ed00ea583fa4fa0badbeef`: [http://localhost:9411/zipkin/traces/f5695ba3b2ed00ea583fa4fa0badbeef](http://localhost:9411/zipkin/traces/f5695ba3b2ed00ea583fa4fa0badbeef)
-http://localhost:9411/zipkin/traces/f5695ba3b2ed00ea583fa4fa0badbeef
 
 Shut down the services when you are finished with the example:
+
 ```sh
 docker-compose down
 ```

exporters/README.md

@@ -10,7 +10,6 @@ Additionally, there are [metric](./metric) and [trace](./trace) only exporters.
 ## Metric Telemetry Only
 
 - [prometheus](./metric/prometheus): Exposes metric telemetry as Prometheus metrics.
-- [test](./metric/test): A development tool when testing the telemetry pipeline.
 
 ## Trace Telemetry Only
 

exporters/metric/prometheus/README.md

@@ -3,6 +3,7 @@
 OpenTelemetry Prometheus exporter
 
 ## Installation
+
 ```
 go get -u go.opentelemetry.io/otel/exporters/metric/prometheus
 ```

exporters/trace/jaeger/README.md

@@ -3,6 +3,7 @@
 OpenTelemetry Jaeger exporter
 
 ## Installation
+
 ```
 go get -u go.opentelemetry.io/otel/exporters/trace/jaeger
 ```