diff --git a/metrics/opentelemetry-metrics/src/main/scala/sttp/tapir/server/metrics/opentelemetry/OpenTelemetryMetrics.scala b/metrics/opentelemetry-metrics/src/main/scala/sttp/tapir/server/metrics/opentelemetry/OpenTelemetryMetrics.scala
index 9389c4c121..dfec33b98a 100644
--- a/metrics/opentelemetry-metrics/src/main/scala/sttp/tapir/server/metrics/opentelemetry/OpenTelemetryMetrics.scala
+++ b/metrics/opentelemetry-metrics/src/main/scala/sttp/tapir/server/metrics/opentelemetry/OpenTelemetryMetrics.scala
@@ -80,15 +80,28 @@ object OpenTelemetryMetrics {
   def requestActive[F[_]](meter: Meter, labels: MetricLabels): Metric[F, LongUpDownCounter] =
     Metric[F, LongUpDownCounter](
       meter
-        .upDownCounterBuilder("request_active")
+        .upDownCounterBuilder("http.server.active_requests")
         .setDescription("Active HTTP requests")
         .setUnit("1")
         .build(),
       onRequest = (req, counter, m) => {
         m.unit {
           EndpointMetric()
-            .onEndpointRequest { ep => m.eval(counter.add(1, asOpenTelemetryAttributes(labels, ep, req))) }
-            .onResponseBody { (ep, _) => m.eval(counter.add(-1, asOpenTelemetryAttributes(labels, ep, req))) }
+            .onEndpointRequest { ep =>
+              m.eval {
+                val attrs = asOpenTelemetryAttributes(labels, ep, req)
+                println(s"[DEBUG] Incrementing active requests with attributes: $attrs")
+
+                counter.add(1, attrs)
+              }
+            }
+            .onResponseBody { (ep, _) =>
+              m.eval {
+                val attrs = asOpenTelemetryAttributes(labels, ep, req)
+                println(s"[DEBUG] Decrementing active requests with attributes: $attrs")
+                counter.add(-1, attrs)
+              }
+            }
             .onException { (ep, _) => m.eval(counter.add(-1, asOpenTelemetryAttributes(labels, ep, req))) }
         }
       }
@@ -97,7 +110,7 @@ object OpenTelemetryMetrics {
   def requestTotal[F[_]](meter: Meter, labels: MetricLabels): Metric[F, LongCounter] =
     Metric[F, LongCounter](
       meter
-        .counterBuilder("request_total")
+        .counterBuilder("http.server.request.total")
         .setDescription("Total HTTP requests")
         .setUnit("1")
         .build(),
@@ -106,8 +119,11 @@ object OpenTelemetryMetrics {
           EndpointMetric()
             .onResponseBody { (ep, res) =>
               m.eval {
-                val otLabels =
+                val otLabels: Attributes =
                   merge(asOpenTelemetryAttributes(labels, ep, req), asOpenTelemetryAttributes(labels, Right(res), None))
+
+                println(s"[DEBUG] Incrementing total requests with labels: $otLabels")
+
                 counter.add(1, otLabels)
               }
             }
@@ -125,14 +141,14 @@ object OpenTelemetryMetrics {
   def requestDuration[F[_]](meter: Meter, labels: MetricLabels): Metric[F, DoubleHistogram] =
     Metric[F, DoubleHistogram](
       meter
-        .histogramBuilder("request_duration")
+        .histogramBuilder("http.server.request.duration")
         .setDescription("Duration of HTTP requests")
-        .setUnit("ms")
+        .setUnit("s")
         .build(),
       onRequest = (req, recorder, m) =>
         m.eval {
           val requestStart = Instant.now()
-          def duration = Duration.between(requestStart, Instant.now()).toMillis.toDouble
+          def duration = Duration.between(requestStart, Instant.now()).toMillis.toDouble / 1000.0
           EndpointMetric()
             .onResponseHeaders { (ep, res) =>
               m.eval {
diff --git a/metrics/opentelemetry-metrics/src/test/scala/sttp/tapir/server/metrics/opentelemetry/OpenTelemetryMetricsTest.scala b/metrics/opentelemetry-metrics/src/test/scala/sttp/tapir/server/metrics/opentelemetry/OpenTelemetryMetricsTest.scala
index fcc096a963..4581b09594 100644
--- a/metrics/opentelemetry-metrics/src/test/scala/sttp/tapir/server/metrics/opentelemetry/OpenTelemetryMetricsTest.scala
+++ b/metrics/opentelemetry-metrics/src/test/scala/sttp/tapir/server/metrics/opentelemetry/OpenTelemetryMetricsTest.scala
@@ -25,7 +25,7 @@ import scala.concurrent.Future
 
 class OpenTelemetryMetricsTest extends AnyFlatSpec with Matchers {
 
-  "default metrics" should "collect requests active" in {
+  "default metrics" should "collect http.server.active_requests" in {
     // given
     val reader = InMemoryMetricReader.create()
     val provider = SdkMeterProvider.builder().registerMetricReader(reader).build()
@@ -51,17 +51,27 @@ class OpenTelemetryMetricsTest extends AnyFlatSpec with Matchers {
 
     // then
     val point = longSumData(reader).head
-    point.getAttributes shouldBe Attributes.of(AttributeKey.stringKey("method"), "GET", AttributeKey.stringKey("path"), "/person")
+    point.getAttributes shouldBe Attributes.of(
+      AttributeKey.stringKey("http.request.method"),
+      "GET",
+      AttributeKey.stringKey("path"),
+      "/person"
+    )
     point.getValue shouldBe 1
 
     ScalaFutures.whenReady(response, Timeout(Span(3, Seconds))) { _ =>
       val point = longSumData(reader).head
-      point.getAttributes shouldBe Attributes.of(AttributeKey.stringKey("method"), "GET", AttributeKey.stringKey("path"), "/person")
+      point.getAttributes shouldBe Attributes.of(
+        AttributeKey.stringKey("http.request.method"),
+        "GET",
+        AttributeKey.stringKey("path"),
+        "/person"
+      )
       point.getValue shouldBe 0
     }
   }
 
-  "default metrics" should "collect requests total" in {
+  "default metrics" should "collect http.server.request.total" in {
     // given
     val reader = InMemoryMetricReader.create()
     val provider = SdkMeterProvider.builder().registerMetricReader(reader).build()
@@ -87,29 +97,29 @@ class OpenTelemetryMetricsTest extends AnyFlatSpec with Matchers {
       .count {
         case dp
             if dp.getAttributes == Attributes.of(
-              AttributeKey.stringKey("method"),
+              AttributeKey.stringKey("http.request.method"),
               "GET",
               AttributeKey.stringKey("path"),
               "/person",
-              AttributeKey.stringKey("status"),
-              "2xx"
+    AttributeKey.longKey("http.response.status_code").asInstanceOf[AttributeKey[Long]], // Explicitly cast to Long
+              200L
             ) && dp.getValue == 2 =>
           true
         case dp
             if dp.getAttributes == Attributes.of(
-              AttributeKey.stringKey("method"),
+              AttributeKey.stringKey("http.request.method"),
               "GET",
               AttributeKey.stringKey("path"),
               "/person",
-              AttributeKey.stringKey("status"),
-              "4xx"
+    AttributeKey.longKey("http.response.status_code").asInstanceOf[AttributeKey[Long]], // Explicitly cast to Long
+              400L
             ) && dp.getValue == 2 =>
           true
         case _ => false
       } shouldBe 2
   }
 
-  "default metrics" should "collect requests duration" in {
+  "default metrics" should "collect http.server.request.duration" in {
     // given
     val reader = InMemoryMetricReader.create()
     val provider = SdkMeterProvider.builder().registerMetricReader(reader).build()
@@ -140,14 +150,12 @@ class OpenTelemetryMetricsTest extends AnyFlatSpec with Matchers {
     val point = reader.collectAllMetrics().asScala.head.getHistogramData.getPoints.asScala
     point.map(_.getAttributes) should contain(
       Attributes.of(
-        AttributeKey.stringKey("method"),
+        AttributeKey.stringKey("http.request.method"),
         "GET",
         AttributeKey.stringKey("path"),
         "/person",
-        AttributeKey.stringKey("status"),
-        "2xx",
-        AttributeKey.stringKey("phase"),
-        "body"
+    AttributeKey.longKey("http.response.status_code").asInstanceOf[AttributeKey[Long]], // Explicitly cast to Long
+        200L
       )
     )
   }
@@ -197,12 +205,12 @@ class OpenTelemetryMetricsTest extends AnyFlatSpec with Matchers {
     // then
     val point = longSumData(reader).head
     point.getAttributes shouldBe Attributes.of(
-      AttributeKey.stringKey("method"),
+      AttributeKey.stringKey("http.request.method"),
       "GET",
       AttributeKey.stringKey("path"),
       "/person",
-      AttributeKey.stringKey("status"),
-      "5xx"
+    AttributeKey.longKey("http.response.status_code").asInstanceOf[AttributeKey[Long]], // Explicitly cast to Long
+      500L
     )
     point.getValue shouldBe 1
   }