Perf tests for monitor exporter (#17067)

* Perf tests for monitor

* oops

* updated

* perf imporves

* perf_mon

sdk/monitor/azure-monitor-opentelemetry-exporter/tests/perfstress_tests/README.md

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+# Monitor Exporter Performance Tests
+
+In order to run the performance tests, the `azure-devtools` package must be installed. This is done as part of the `dev_requirements`.
+Start by creating a new virtual environment for your perf tests. This will need to be a Python 3 environment, preferably >=3.7.
+
+### Setup for test resources
+
+These tests will run against a pre-configured Application Insights resource. The following environment variable will need to be set for the tests to access the live resources:
+```
+APPLICATIONINSIGHTS_CONNECTION_STRING=<connection string for app insights>
+```
+
+### Setup for perf test runs
+
+```cmd
+(env) ~/azure-monitor-opentelemetry-exporter> pip install -r dev_requirements.txt
+(env) ~/azure-monitor-opentelemetry-exporter> pip install -e .
+```
+
+## Test commands
+
+```cmd
+(env) ~/azure-monitor-opentelemetry-exporter> cd tests
+(env) ~/azure-monitor-opentelemetry-exporter/tests> perfstress MonitorExporterPerfTest --sync --num-spans=10
+```
+
+### Common perf command line options
+These options are available for all perf tests:
+- `--duration=10` Number of seconds to run as many operations (the "run" function) as possible. Default is 10.
+- `--iterations=1` Number of test iterations to run. Default is 1.
+- `--parallel=1` Number of tests to run in parallel. Default is 1.
+- `--warm-up=5` Number of seconds to spend warming up the connection before measuring begins. Default is 5.
+- `--sync` Whether to run the tests in sync or async. Default is False (async). This must be set to True explicitly.
+- `--no-cleanup` Whether to keep newly created resources after test run. Default is False (resources will be deleted).
+
+### MonitorExporter Test options
+These options are available for all monitor exporter perf tests:
+- `--num-spans` Number ofspans to be exported. Defaults to 10.
+
+### T2 Tests
+The tests currently written for the T2 SDK:
+- `MonitorExporterPerfTest` Collects sample traces and exports to application insights.
+
+## Example command
+
+**Note:** The `--sync` flag must be explicitly set for this package since there is no `async` support.
+
+```cmd
+(env) ~/azure-monitor-opentelemetry-exporter/tests> perfstress MonitorExporterPerfTest --sync --num-spans=10
+```

sdk/monitor/azure-monitor-opentelemetry-exporter/tests/perfstress_tests/trace_exporter.py

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+#-------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See License.txt in the project root for
+# license information.
+#--------------------------------------------------------------------------
+
+from azure_devtools.perfstress_tests import PerfStressTest
+
+from azure.monitor.opentelemetry.exporter import AzureMonitorTraceExporter
+
+from opentelemetry import trace
+from opentelemetry.sdk.trace import TracerProvider
+
+from azure.monitor.opentelemetry.exporter import AzureMonitorTraceExporter
+
+class MonitorExporterPerfTest(PerfStressTest):
+    def __init__(self, arguments):
+        super().__init__(arguments)
+
+        # auth configuration
+        connection_string = self.get_from_env("APPLICATIONINSIGHTS_CONNECTION_STRING")
+
+        # Create clients
+        self.exporter = AzureMonitorTraceExporter.from_connection_string(connection_string)
+
+        trace.set_tracer_provider(TracerProvider())
+        tracer = trace.get_tracer(__name__)
+        self.spans_list = []
+        for _ in range(self.args.num_spans):
+            with tracer.start_as_current_span(
+                name="name"
+            ) as span:
+                self.spans_list.append(span)
+
+    def run_sync(self):
+        """The synchronous perf test.
+        
+        Try to keep this minimal and focused. Using only a single client API.
+        Avoid putting any ancilliary logic (e.g. generating UUIDs), and put this in the setup/init instead
+        so that we're only measuring the client API call.
+        """
+        self.exporter.export(self.spans_list)
+
+    @staticmethod
+    def add_arguments(parser):
+        super(MonitorExporterPerfTest, MonitorExporterPerfTest).add_arguments(parser)
+        parser.add_argument('-n', '--num-spans', nargs='?', type=int, help='Number of spans to be exported. Defaults to 10', default=10)