Compatibility with Nvidia Triton:
ONNX files contain opsets and newer runtimes are backwards compatible but not vica versa. There is a table of compatible runtimes and opsets here: https://onnxruntime.ai/docs/reference/compatibility.html
In python use pip to downgrade to an older runtime if needed:
pip install onnxruntime==<specific-version>
This affects exporting models via Huggingface Optimum