SSMput_parameter events currently always emitoperation: "Create", even when overwriting an existing parameter. AWS emitsoperation: "Update" on overwrite, so downstream listeners see incorrect event detail in LocalStack.

Changes

Set the SSM event operation to"Update" whenput_parameter returns a version > 1, otherwise"Create".
Added a unit test to assert Create→Update emission when overwriting.

Tests

python -m pytest tests/unit/test_ssm_put_parameter_events.py
make lint
make format

Fixes:bug: ssm parameter update should send "Update" event, but sends "Create" event #13409

jasjaapdua added2 commits

November 28, 2025 19:25

fix(ssm): emit update event on parameter overwrite

6281a87

test(ssm): cover event emission on put_parameter overwrite

fe6c895

jasjaapdua requested review fromdominikschubert andviren-nadkarni ascode owners

November 29, 2025 00:38

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localstack-bot reviewed

Nov 29, 2025

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