def UpdateMetadata(metadata, key, value):
  if IsValueValid(value):
    metadata[key] = value
Returns a deferred whose callback will be passed a list of xover
dataset/ETHPy150Open GoogleCloudPlatform/PerfKitBenchmarker/perfkitbenchmarker/linux_benchmarks/bonnie_benchmark.py/UpdateMetadata--crossover with--dataset/ETHPy150Open kuri65536/python-for-android/python-modules/twisted/twisted/news/database.py/INewsStorage.xoverRequest