new_contents: import os
  import mmstats
  import libgettid
  
  class MyStats(mmstats.BaseMmStats):
      pid = mmstats.StaticUIntField(label="sys.pid", value=os.getpid)
      tid = mmstats.StaticInt64Field(label="sys.tid", value=libgettid.gettid)
      uid = mmstats.StaticUInt64Field(label="sys.uid", value=os.getuid)
      gid = mmstats.StaticUInt64Field(label="sys.gid", value=os.getgid)
      errors = mmstats.UIntStat(label="com.urbanairship.app.errors")
      warnings = mmstats.UIntStat(label="com.urbanairship.app.warnings")
      queries = mmstats.UIntStat(label="com.urbanairship.app.queries")
      cache_hits = mmstats.UIntStat(label="com.urbanairship.app.cache_hits")
      cache_misses = mmstats.UIntStat(label="com.urbanairship.app.cache_misses")
      degraded = mmstats.BoolStat(label="com.urbanairship.app.degraded")
  
  stats = MyStats(filename="mmstats-test-mystats")
  stats.degraded = True
  stats.errors += 1
  stats.cache_hits += 1000
  stats.queries = 50
  
subject: Add basic example