`class Statistics`

Tracks various statistics relating to child instances in a container.

Definitions

How many child instances have been spawned.

How many child instances have been restarted.

How many child instances have failed.

Increment the number of spawns by 1.

def spawn!
	@spawns += 1
end

Increment the number of restarts by 1.

def restart!
	@restarts += 1
end

Increment the number of failures by 1.

def failure!
	@failures += 1
end

Whether there have been any failures.

def failed?
	@failures > 0
end

Append another statistics instance into this one.

def << other
	@spawns += other.spawns
	@restarts += other.restarts
	@failures += other.failures
end