Add load test that measures QPS for dashboard display. (#26153)

This changes adds a test that measures QPS. The tests currently running measure latency, which is more variable.

tools/internal_ci/linux/grpc_e2e_performance_v2.sh

@@ -31,12 +31,12 @@ gcloud container clusters get-credentials benchmarks-prod \
 
 # This is subject to change. Runs a single test and does not wait for the
 # result.
-tools/run_tests/performance/loadtest_config.py -l go \
+tools/run_tests/performance/loadtest_config.py -l c++ -l go \
     -t ./tools/run_tests/performance/templates/loadtest_template_basic_all_languages.yaml \
     -s client_pool=workers-8core -s server_pool=workers-8core \
     -s big_query_table=e2e_benchmarks.experimental_results \
     -s timeout_seconds=900 --prefix="kokoro-test" -u "$(date +%Y%m%d%H%M%S)" \
-    -r '(go_generic_sync_streaming_ping_pong_secure|go_protobuf_sync_unary_ping_pong_secure)' \
+    -r '(go_generic_sync_streaming_ping_pong_secure|go_protobuf_sync_unary_ping_pong_secure|cpp_protobuf_async_streaming_qps_unconstrained_secure)$' \
     -o ./loadtest.yaml
 
 # Dump the contents of the loadtest.yaml (since loadtest_config.py doesn't

tools/run_tests/performance/loadtest_config.py

@@ -44,6 +44,19 @@ CONFIGURATION_FILE_HEADER_COMMENT = """
 # https://github.com/grpc/grpc/blob/master/tools/run_tests/performance/README.md#grpc-oss-benchmarks
 """
 
+# TODO(paulosjca): Merge label_language and image_language into one function.
+# These functions are necessary because 'c++' is not allowed as a label value in
+# kubernetes, and because languages share images in the existing templates. Once
+# the templates are reorganized and most image mapping is removed, the two
+# functions can be merged into one.
+
+
+def label_language(language: str) -> str:
+    """Convert scenario language to place in a resource label."""
+    return {
+        'c++': 'cxx',
+    }.get(language, language)
+
 
 def image_language(language: str) -> str:
     """Convert scenario languages to image languages."""
@@ -159,7 +172,8 @@ def gen_loadtest_configs(
             metadata['name'] = name
             if 'labels' not in metadata:
                 metadata['labels'] = dict()
-            metadata['labels']['language'] = language_config.language
+            metadata['labels']['language'] = label_language(
+                language_config.language)
             metadata['labels']['prefix'] = prefix
             if 'annotations' not in metadata:
                 metadata['annotations'] = dict()