returns 503 status code and restarts OpenTSDB when the system is unstable. (https://rbcommons.com/s/pepperdata/r/2821)
- Added a new url end point "/restartrestartrestart" to restart the OpenTSDB
server. - Sends the response code 503 to clients when the OpenTSDB server is
unstable. - Restarts OpenTSDB by running a restart shell script when the system
is unstable. - The system is considered to be unstable when it experienced any
very long timeouts such ten minutes or an hour.