class ElasticAPM::Metrics::Metric

def initialize(
  key,
  initial_value: nil,
  tags: nil,
  reset_on_collect: false
)
  @key = key
  @initial_value = initial_value
  @value = initial_value
  @tags = tags
  @reset_on_collect = reset_on_collect
  @mutex = Mutex.new
end