Some netty addX(..., ChannelHandler, ...) methods aren't being instrumented

[trask]

The netty instrumentation only applies to some of the addX methods:

opentelemetry-java-instrumentation/instrumentation/netty/netty-4.1/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/netty/v4_1/NettyChannelPipelineInstrumentation.java

Lines 43 to 45 in ce85fd9

	.and(nameStartsWith("add"))
	.and(takesArgument(1, String.class))
	.and(takesArgument(2, named("io.netty.channel.ChannelHandler"))),

Some of the addX methods appear to delegate to other addX methods which are instrumented, but at least this one doesn't appear to:

ChannelPipeline addAfter(EventExecutorGroup group, String baseName, String name, ChannelHandler handler)

(it's a separate question whether we should rely on delegation)

I'm not aware of this affecting anyone, I only noticed while reviewing #4053 and wanted to track.

[trask]

Closing, I think support for some of these has been added where users have been affected, can revisit later if anyone has renewed interest.