A reporter that prints events and metrics to the terminal.

This is useful for debugging and discovering all available measurements and metadata in an event.

For example, imagine the given metrics:

metrics = [
  last_value("vm.memory.binary", unit: :byte),
  counter("vm.memory.total")
]

A console reporter can be started as a child of your supervision tree as:

{Telemetry.Metrics.ConsoleReporter, metrics: metrics}

Now when the "vm.memory" telemetry event is dispatched, we will see reports like this:

[Telemetry.Metrics.ConsoleReporter] Got new event!
Event name: vm.memory
All measurements: %{binary: 100, total: 200}
All metadata: %{}

Metric measurement: :binary (last_value)
With value: 100 byte
And tag values: %{}

Metric measurement: :total (counter)
With value: 200
And tag values: %{}

In other words, every time there is an event for any of the registered metrics, it prints the event measurement and metadata, and then it prints information about each metric to the user.