button : std.CountTimer()
check : std.Sum()
bell : test.Sink(store_tokens=true)

button.integer > check.integer
check.integer > bell.token


apply button : node_attr_match(index=["address", {"locality": "outside"}])
apply bell : node_attr_match(index=["address", {"locality": "inside"}])
apply check : node_attr_match(index=["node_name", {"name": "display"}])
