add "scenarios" top level element
diff --git a/tools/run_tests/performance/scenario_config_exporter.py b/tools/run_tests/performance/scenario_config_exporter.py
index 33e7b17..23aad5c 100755
--- a/tools/run_tests/performance/scenario_config_exporter.py
+++ b/tools/run_tests/performance/scenario_config_exporter.py
@@ -15,6 +15,8 @@
# limitations under the License.
# Helper script to extract JSON scenario definitions from scenario_config.py
+# Useful to construct "ScenariosJSON" configuration accepted by the OSS benchmarks framework
+# See https://github.com/grpc/test-infra/blob/master/config/samples/cxx_example_loadtest.yaml
import json
import re
@@ -47,7 +49,8 @@
filename = "%s%s.json" % (filename_prefix, scenario['name'])
print('Writing file %s' % filename, file=sys.stderr)
with open(filename, 'w') as outfile:
- json.dump(scenario, outfile, indent=2)
+ # the dump file should have {"scenarios" : []} as the top level element
+ json.dump({'scenarios': [scenario]}, outfile, indent=2)
if __name__ == "__main__":
