CloudEvents output data format

[[outputs.file]]
  files = ["stdout", "/tmp/metrics.out"]

  ## Data format to output.
  data_format = "cloudevents"

  ## Specification version to use for events.
  ## Supported versions: "0.3" and "1.0" (default).
  # cloudevents_version = "1.0"

  ## Event source specifier.
  ## Overwrites the source header field with the given value.
  # cloudevents_source = "telegraf"

  ## Tag to use as event source specifier.
  ## Overwrites the source header field with the value of the specified tag.
  ## Takes precedence over 'cloudevents_source' if both are set.
  ## Falls back to 'cloudevents_source' if the tag doesn't exist for a metric.
  # cloudevents_source_tag = ""

  ## Event-type specifier to overwrite the default value.
  ## Default for single metric: 'com.influxdata.telegraf.metric'
  ## Default for batch: 'com.influxdata.telegraf.metrics' (plural)
  # cloudevents_event_type = ""

  ## Set time header of the event.
  ## Supported values:
  ##   none     -- do not set event time
  ##   earliest -- use timestamp of the earliest metric
  ##   latest   -- use timestamp of the latest metric
  # cloudevents_time = "earliest"