[Azure Monitor OpenTelemetry Exporter] Capture Measurements when Crea…

…ting Logs (#29511)

### Packages impacted by this PR
@azure/monitor-opentelemetry-exporter

### Issues associated with this PR
microsoft/ApplicationInsights-node.js#1318

### Describe the problem that is addressed by this PR
Previously measurements passed from the Application Insights 3.X SDK
were not being populated on logs in the exporter. These should be
populated from the log body and exported to breeze.

### Are there test cases added in this PR? _(If not, why?)_
Yes, added a test case to ensure that when measurements exist in the log
body field, they're populated on the final envelope.

### Checklists
- [x] Added impacted package name to the issue description
- [ ] Does this PR needs any fixes in the SDK Generator?** _(If so,
create an Issue in the
[Autorest/typescript](https://github.com/Azure/autorest.typescript)
repository and link it here)_
- [x] Added a changelog (if necessary)

sdk/monitor/monitor-opentelemetry-exporter/CHANGELOG.md

@@ -1,5 +1,11 @@
 # Release History
 
+## Unreleased ()
+
+### Features Added
+
+- Capture and export measurements when creating log records from the Application Insights 3.X SDK.
+
 ## 1.0.0-beta.22 (2024-04-16)
 
 ### Features Added

sdk/monitor/monitor-opentelemetry-exporter/src/utils/logUtils.ts

@@ -45,7 +45,7 @@ export function logToEnvelope(log: ReadableLogRecord, ikey: string): Envelope |
   const sampleRate = 100;
   const instrumentationKey = ikey;
   const tags = createTagsFromLog(log);
-  const [properties, measurements] = createPropertiesFromLog(log);
+  let [properties, measurements] = createPropertiesFromLog(log);
   let name: string;
   let baseType: string;
   let baseData: MonitorDomain;
@@ -85,6 +85,7 @@ export function logToEnvelope(log: ReadableLogRecord, ikey: string): Envelope |
     baseType = String(log.attributes[ApplicationInsightsBaseType]);
     name = getLegacyApplicationInsightsName(log);
     baseData = getLegacyApplicationInsightsBaseData(log);
+    measurements = getLegacyApplicationInsightsMeasurements(log);
     if (!baseData) {
       // Failed to parse log
       return;
@@ -180,6 +181,14 @@ function getLegacyApplicationInsightsName(log: ReadableLogRecord): string {
   return name;
 }
 
+function getLegacyApplicationInsightsMeasurements(log: ReadableLogRecord): Measurements {
+  let measurements: Measurements = {};
+  if ((log.body as MonitorDomain)?.measurements) {
+    measurements = { ...(log.body as MonitorDomain).measurements };
+  }
+  return measurements;
+}
+
 function getLegacyApplicationInsightsBaseData(log: ReadableLogRecord): MonitorDomain {
   let baseData: MonitorDomain = {
     version: 2,

sdk/monitor/monitor-opentelemetry-exporter/test/internal/logUtils.test.ts

@@ -114,7 +114,7 @@ describe("logUtils.ts", () => {
         severityLevel: `Information`,
         version: 2,
         properties: expectedProperties,
-        measurements: {},
+        measurements: emptyMeasurements,
       };
 
       const envelope = logToEnvelope(testLogRecord as ReadableLogRecord, "ikey");
@@ -178,6 +178,7 @@ describe("logUtils.ts", () => {
       const data: MessageData = {
         message: "testMessage",
         severityLevel: "Verbose",
+        measurements: { testMeasurement: 1 },
         version: 2,
       };
       testLogRecord.attributes = {
@@ -192,12 +193,15 @@ describe("logUtils.ts", () => {
         "extra.attribute": "foo",
         [SemanticAttributes.MESSAGE_TYPE]: "test message type",
       };
+      const expectedMeasurements: Measurements = {
+        testMeasurement: 1,
+      };
       const expectedBaseData: Partial<MessageData> = {
         message: `testMessage`,
         severityLevel: `Verbose`,
         version: 2,
         properties: expectedProperties,
-        measurements: {},
+        measurements: expectedMeasurements,
       };
 
       const envelope = logToEnvelope(testLogRecord as ReadableLogRecord, "ikey");
@@ -207,7 +211,7 @@ describe("logUtils.ts", () => {
         100,
         "MessageData",
         expectedProperties,
-        emptyMeasurements,
+        expectedMeasurements,
         expectedBaseData,
         expectedTime,
       );