fix last bugs

Author: hughsimpson

reporters/kamon-opentelemetry/src/main/resources/reference.conf

@@ -81,13 +81,13 @@ kamon.modules {
   otel-trace-reporter {
     enabled = true
     name = "OpenTelemetry Trace Reporter"
-    description = "Sends trace data to a OpenTelemetry server via gRPC/REST+json"
+    description = "Sends trace data to a OpenTelemetry server via gRPC/HTTP+protobuf"
     factory = "kamon.otel.OpenTelemetryTraceReporter$Factory"
   }
   otel-metrics-reporter {
     enabled = true
     name = "OpenTelemetry Metrics Reporter"
-    description = "Sends metrics data to a OpenTelemetry server via gRPC/REST+json"
+    description = "Sends metrics data to a OpenTelemetry server via gRPC/HTTP+protobuf"
     factory = "kamon.otel.OpenTelemetryMetricsReporter$Factory"
   }
 }

reporters/kamon-opentelemetry/src/main/scala/kamon/otel/Services.scala

@@ -24,7 +24,7 @@ import io.opentelemetry.sdk.metrics.`export`.MetricExporter
 import io.opentelemetry.sdk.metrics.data.MetricData
 import io.opentelemetry.sdk.trace.`export`.SpanExporter
 import io.opentelemetry.sdk.trace.data.SpanData
-import kamon.otel.OpenTelemetryConfiguration.Component.Trace
+import kamon.otel.OpenTelemetryConfiguration.Component.{ Metrics, Trace }
 import org.slf4j.LoggerFactory
 
 import java.io.Closeable
@@ -106,18 +106,18 @@ private[otel] object OtlpMetricsService {
    * @param config
    * @return
    */
-  def apply(config: Config): MetricsService = new OtlpMetricsService(OpenTelemetryConfiguration(config, Trace))
+  def apply(config: Config): MetricsService = new OtlpMetricsService(OpenTelemetryConfiguration(config, Metrics))
 }
 
 private[otel] class OtlpMetricsService(c: OpenTelemetryConfiguration) extends MetricsService {
   private val compressionMethod = if (c.compressionEnabled) "gzip" else "none"
   private val delegate: MetricExporter = c.protocol match {
     case "grpc" =>
-      val builder = OtlpHttpMetricExporter.builder().setEndpoint(c.endpoint).setCompression(compressionMethod).setTimeout(c.timeout)
+      val builder = OtlpGrpcMetricExporter.builder().setEndpoint(c.endpoint).setCompression(compressionMethod).setTimeout(c.timeout)
       c.headers.foreach { case (k, v) => builder.addHeader(k, v) }
       builder.build()
     case "http/protobuf" =>
-      val builder = OtlpGrpcMetricExporter.builder().setEndpoint(c.endpoint).setCompression(compressionMethod).setTimeout(c.timeout)
+      val builder = OtlpHttpMetricExporter.builder().setEndpoint(c.endpoint).setCompression(compressionMethod).setTimeout(c.timeout)
       c.headers.foreach { case (k, v) => builder.addHeader(k, v) }
       builder.build()
   }