{
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        "label",
        "config",
        "host"
      ],
      "optional_keys": [
        "cross"
      ]
    },
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        "task_driver",
        "config",
        "host"
      ],
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      ]
    },
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      ],
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      ]
    },
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      ],
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        "extra_config"
      ]
    },
    "Canary": {
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        "project"
      ]
    },
    "CodeSize": {
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        "os",
        "compiler",
        "target_arch",
        "configuration"
      ],
      "optional_keys": [
        "extra_config"
      ]
    },
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        "frequency"
      ],
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        "extra_config"
      ]
    },
    "Infra": {
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        "frequency"
      ],
      "optional_keys": [
        "extra_config"
      ]
    },
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        "compiler",
        "model",
        "cpu_or_gpu",
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        "test_filter"
      ],
      "optional_keys": [
        "extra_config"
      ]
    },
    "Test": {
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        "compiler",
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        "cpu_or_gpu",
        "cpu_or_gpu_value",
        "arch",
        "configuration",
        "test_filter"
      ],
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        "extra_config"
      ]
    },
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        "compiler",
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        "cpu_or_gpu",
        "cpu_or_gpu_value",
        "arch",
        "configuration",
        "test_filter"
      ],
      "optional_keys": [
        "extra_config"
      ]
    },
    "Upload": {
      "recurse_roles": [
        "Build",
        "BuildStats",
        "Perf",
        "Test"
      ]
    }
  },
  "builder_name_sep": "-"
}