[Monitor OpenTelemetry Exporter] Fix Integration Tests Flush (Azure#3…

…2196)

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

### Issues associated with this PR
Azure#32101 

### Describe the problem that is addressed by this PR
Integration tests were failing as the flush was not completing.

### 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/package.json

@@ -75,6 +75,7 @@
   },
   "devDependencies": {
     "@azure-tools/test-utils-vitest": "^1.0.0",
+    "@azure/core-util": "^1.11.0",
     "@azure/dev-tool": "^1.0.0",
     "@azure/eslint-plugin-azure-sdk": "^3.0.0",
     "@opentelemetry/instrumentation": "^0.56.0",

sdk/monitor/monitor-opentelemetry-exporter/test/internal/functional/log.test.ts

@@ -40,7 +40,7 @@ describe("Log Exporter Scenarios", () => {
       setTimeout(() => {
         assertLogExpectation(ingest, scenario.expectation);
         assertCount(ingest, scenario.expectation);
-      }, 1);
+      }, 100);
     });
   });
 });

sdk/monitor/monitor-opentelemetry-exporter/test/internal/functional/metric.test.ts

@@ -35,8 +35,10 @@ describe("Metric Exporter Scenarios", () => {
       await scenario.run();
       // promisify doesn't work on this, so use callbacks/done for now
       await scenario.flush();
-      assertMetricExpectation(ingest, scenario.expectation);
-      assertCount(ingest, scenario.expectation);
+      setTimeout(() => {
+        assertMetricExpectation(ingest, scenario.expectation);
+        assertCount(ingest, scenario.expectation);
+      }, 100);
     });
   });
 });

sdk/monitor/monitor-opentelemetry-exporter/test/internal/functional/trace.test.ts

@@ -37,8 +37,10 @@ describe("Trace Exporter Scenarios", () => {
     it("should work", async () => {
       await scenario.run();
       await scenario.flush();
-      assertTraceExpectation(ingest, scenario.expectation);
-      assertCount(ingest, scenario.expectation);
+      setTimeout(() => {
+        assertTraceExpectation(ingest, scenario.expectation);
+        assertCount(ingest, scenario.expectation);
+      }, 100);
     });
   });
 
@@ -69,10 +71,11 @@ describe("Trace Exporter Scenarios", () => {
 
     it("should work with OTel resource metric disabled", async () => {
       await scenario.run();
-
       await scenario.flush();
-      assertTraceExpectation(ingest, scenario.disabledExpectation);
-      assertCount(ingest, scenario.disabledExpectation);
+      setTimeout(() => {
+        assertTraceExpectation(ingest, scenario.disabledExpectation);
+        assertCount(ingest, scenario.disabledExpectation);
+      }, 100);
     });
   });
 });

sdk/monitor/monitor-opentelemetry/test/internal/unit/metrics/standardMetrics.test.ts

@@ -244,7 +244,7 @@ describe("#StandardMetricsHandler", () => {
       autoCollect.recordSpan(serverSpan);
     }
 
-    await new Promise((resolve) => setTimeout(resolve, 1000));
+    await new Promise((resolve) => setTimeout(resolve, 1500));
     assert.ok(exportStub.called);
     const resourceMetrics = exportStub.args[0][0];
     const scopeMetrics = resourceMetrics.scopeMetrics;