[telemetry metrics] Support Jaeger visualisation since it expects metrics in microseconds

GitOrigin-RevId: 8b1d7cc5a2dc9a3ead43d36552e6ebba9457f5a0

tools/intellij.tools.ide.metrics.benchmark/testResources/telemetry/open-telemetry-unit-perf-test.json

@@ -31,8 +31,10 @@
           "spanID": "809f150acd521f74",
           "operationName": "Attempt: 1",
           "processID": "p1",
-          "startTime": 1700119096816631,
-          "duration": 243012000,
+          "startTime": 1700119096816,
+          "duration": 243012,
+          "startTimeNano": 1700119096816631,
+          "durationNano": 243012000,
           "tags": [
             {
               "key": "Attempt status",
@@ -58,8 +60,10 @@
           "spanID": "d904b99697b813b7",
           "operationName": "simple perf test",
           "processID": "p1",
-          "startTime": 1700119096713000,
-          "duration": 379215000,
+          "startTime": 1700119096713,
+          "duration": 379215,
+          "startTimeNano": 1700119096713000,
+          "durationNano": 379215000,
           "tags": [
             {
               "key": "warmup",
@@ -73,8 +77,10 @@
           "spanID": "081a305a1f14d933",
           "operationName": "Attempt: 1",
           "processID": "p1",
-          "startTime": 1700119097395956,
-          "duration": 486235000,
+          "startTime": 1700119097395,
+          "duration": 486235,
+          "startTimeNano": 1700119097395956,
+          "durationNano": 486235000,
           "tags": [
             {
               "key": "Attempt status",
@@ -95,8 +101,10 @@
           "spanID": "8e69596e1b91aa55",
           "operationName": "Attempt: 2",
           "processID": "p1",
-          "startTime": 1700119098210549,
-          "duration": 110988000,
+          "startTime": 1700119098210,
+          "duration": 110988,
+          "startTimeNano": 1700119098210549,
+          "durationNano": 110988000,
           "tags": [
             {
               "key": "Attempt status",
@@ -117,8 +125,10 @@
           "spanID": "23c840e94caf056f",
           "operationName": "Attempt: 3",
           "processID": "p1",
-          "startTime": 1700119098749467,
-          "duration": 324189000,
+          "startTime": 1700119098749,
+          "duration": 324189,
+          "startTimeNano": 1700119098749467,
+          "durationNano": 324189000,
           "tags": [
             {
               "key": "Attempt status",
@@ -139,8 +149,10 @@
           "spanID": "c1ccfdfe0001bb6a",
           "operationName": "simple perf test",
           "processID": "p1",
-          "startTime": 1700119097093000,
-          "duration": 2004871000,
+          "startTime": 1700119097093,
+          "duration": 2004871,
+          "startTimeNano": 1700119097093000,
+          "durationNano": 2004871000,
           "tags": [
             {
               "key": "warmup",

tools/intellij.tools.ide.metrics.benchmark/testSrc/com/intellij/tools/ide/metrics/benchmark/SpanExtractionFromUnitPerfTest.kt

@@ -107,7 +107,8 @@ class SpanExtractionFromUnitPerfTest {
     jacksonObjectMapper().writerWithDefaultPrettyPrinter().writeValue(reportFile.toFile(), metricsDto)
   }
 
-  fun unitPerfTestsMetricsExtraction(testInfo: TestInfo) = runBlocking {
+  @Test
+  fun `unit perf test metrics extraction - nanosecond precision`(testInfo: TestInfo) = runBlocking {
     val mainMetricName = "simple perf test"
 
     val extractedMetrics = BenchmarksSpanMetricsCollector(spanName = mainMetricName,

tools/intellij.tools.ide.metrics.collector/src/com/intellij/tools/ide/metrics/collector/telemetry/SpanElement.kt

@@ -3,9 +3,10 @@
 package com.intellij.tools.ide.metrics.collector.telemetry
 
 import kotlinx.serialization.Contextual
+import kotlinx.serialization.ExperimentalSerializationApi
 import kotlinx.serialization.Serializable
+import kotlinx.serialization.json.JsonNames
 import java.time.Instant
-import kotlin.math.roundToLong
 import kotlin.time.Duration
 
 /**
@@ -37,20 +38,28 @@ internal fun toSpanElement(span: SpanData): SpanElement {
   return SpanElement(
     isWarmup = isWarmup(tags),
     name = span.operationName,
-    duration = span.duration,
-    startTimestamp = span.startTime,
+    duration = span.durationNano,
+    startTimestamp = span.startTimeNano,
     spanId = span.spanID,
     parentSpanId = span.getParentSpanId(),
     tags = tags,
   )
 }
 
+@OptIn(ExperimentalSerializationApi::class)
 @Serializable
 data class SpanData(
   @JvmField val spanID: String,
   @JvmField val operationName: String,
-  @Contextual val duration: Duration,
-  @Contextual val startTime: Instant,
+
+  // see com.intellij.platform.diagnostic.telemetry.exporters.JaegerJsonSpanExporter.export
+  //@Serializable(with = DurationSerializer::class)
+  @JsonNames("duration")
+  @Contextual val durationNano: Duration,
+  //@Serializable(with = InstantSerializer::class)
+  @JsonNames("startTime")
+  @Contextual val startTimeNano: Instant,
+
   @JvmField val references: List<SpanRef> = emptyList(),
   @JvmField val tags: List<SpanTag> = emptyList(),
 )