Github user bowenli86 commented on the issue:
https://github.com/apache/flink/pull/3736
@StephanEwen @zentol I shaded okhttp3 and okio from flink-metrics-datadog.
I didn't use '<if>shade-flink</id>' because I found it somehow prevents me from
building a uber jar. Let me know if it's ok to shade them this way.
```
$ jar -tf
target/flink-metrics-datadog-1.3-SNAPSHOT-jar-with-dependencies.jar
META-INF/
META-INF/MANIFEST.MF
META-INF/DEPENDENCIES
META-INF/LICENSE
META-INF/NOTICE
org/
org/apache/
org/apache/flink/
org/apache/flink/metrics/
org/apache/flink/metrics/datadog/
org/apache/flink/metrics/datadog/DatadogHttpClient.class
org/apache/flink/metrics/datadog/DatadogHttpReporter$DatadogHttpRequest.class
org/apache/flink/metrics/datadog/DatadogHttpReporter.class
org/apache/flink/metrics/datadog/DCounter.class
org/apache/flink/metrics/datadog/DGauge.class
org/apache/flink/metrics/datadog/DMeter.class
org/apache/flink/metrics/datadog/DMetric.class
org/apache/flink/metrics/datadog/DSeries.class
org/apache/flink/metrics/datadog/MetricType.class
META-INF/maven/
META-INF/maven/org.apache.flink/
META-INF/maven/org.apache.flink/flink-metrics-datadog/
META-INF/maven/org.apache.flink/flink-metrics-datadog/pom.xml
META-INF/maven/org.apache.flink/flink-metrics-datadog/pom.properties
META-INF/maven/org.apache.flink/force-shading/
META-INF/maven/org.apache.flink/force-shading/pom.xml
META-INF/maven/org.apache.flink/force-shading/pom.properties
org/apache/flink/shaded/
org/apache/flink/shaded/okhttp3/
org/apache/flink/shaded/okhttp3/Address.class
.....
org/apache/flink/shaded/okhttp3/WebSocketListener.class
META-INF/maven/com.squareup.okhttp3/
META-INF/maven/com.squareup.okhttp3/okhttp/
META-INF/maven/com.squareup.okhttp3/okhttp/pom.xml
META-INF/maven/com.squareup.okhttp3/okhttp/pom.properties
org/apache/flink/shaded/okio/
org/apache/flink/shaded/okio/AsyncTimeout$1.class
...
org/apache/flink/shaded/okio/Util.class
META-INF/maven/com.squareup.okio/
META-INF/maven/com.squareup.okio/okio/
META-INF/maven/com.squareup.okio/okio/pom.xml
META-INF/maven/com.squareup.okio/okio/pom.properties
```
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