api/model/topology/heron.py [72:91]:
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        errors: List[Dict[str, str]] = []
        if "cluster" not in request.args:
            errors.append({"type": "MissingParameter",
                           "error": "'cluster' parameter should be supplied"})

        if "environ" not in request.args:
            errors.append({"type": "MissingParameter",
                           "error": "'environ' parameter should be supplied"})

        if "model" not in request.args:
            errors.append({"type": "MissingParameter",
                           "error": ("At least one 'model' parameter should "
                                     "be supplied. Supply 'all' to run all "
                                     "configured models")})

        # Return useful errors to the client if any parameters are missing
        if errors:
            return {"errors": errors}, 400

        LOG.info("Processing performance modelling request for topology: %s, "
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api/model/topology/heron.py [166:185]:
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        errors: List[Dict[str, str]] = []
        if "cluster" not in request.args:
            errors.append({"type": "MissingParameter",
                           "error": "'cluster' parameter should be supplied"})

        if "environ" not in request.args:
            errors.append({"type": "MissingParameter",
                           "error": "'environ' parameter should be supplied"})

        if "model" not in request.args:
            errors.append({"type": "MissingParameter",
                           "error": ("At least one 'model' parameter should "
                                     "be supplied. Supply 'all' to run all "
                                     "configured models")})

        # Return useful errors to the client if any parameters are missing
        if errors:
            return {"errors": errors}, 400

        LOG.info("Processing performance modelling request for topology: %s, "
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