Big Brother Metric Protocol v0.2.0

New Big Brother Protocol version:

request_seconds_bucket{type, status, isError, method, addr, le}
request_seconds_count{type, status, isError, method, addr}
request_seconds_sum{type, status, isError, method, addr}
response_size_bytes{type, status, isError, method, addr}
dependency_up{name}
application_info{version}