Remove unused, and add experimental server telemetry

Author: trask

instrumentation/ktor/ktor-2-common/library/src/main/kotlin/io/opentelemetry/instrumentation/ktor/v2_0/common/AbstractKtorClientTelemetryBuilder.kt

@@ -116,12 +116,4 @@ abstract class AbstractKtorClientTelemetryBuilder(
     val response: HttpResponse?,
     val error: Throwable?
   )
-
-  /**
-   * Can be used via the unstable method {@link
-   * Experimental#setEmitExperimentalHttpClientMetrics(AbstractKtorClientTelemetryBuilder, boolean)}.
-   */
-  internal fun emitExperimentalHttpClientMetrics() {
-    builder.setEmitExperimentalHttpClientMetrics(true)
-  }
 }

instrumentation/ktor/ktor-2-common/library/src/main/kotlin/io/opentelemetry/instrumentation/ktor/v2_0/common/internal/Experimental.kt

@@ -6,12 +6,17 @@
 package io.opentelemetry.instrumentation.ktor.v2_0.common.internal
 
 import io.opentelemetry.instrumentation.ktor.v2_0.common.AbstractKtorClientTelemetryBuilder
+import io.opentelemetry.instrumentation.ktor.v2_0.common.AbstractKtorServerTelemetryBuilder
 
 class Experimental private constructor() {
 
   companion object {
     fun emitExperimentalTelemetry(builder: AbstractKtorClientTelemetryBuilder) {
       builder.internalBuilder.setEmitExperimentalHttpClientMetrics(true)
     }
+
+    fun emitExperimentalTelemetry(builder: AbstractKtorServerTelemetryBuilder) {
+      builder.builder.setEmitExperimentalHttpServerMetrics(true)
+    }
   }
 }