Update health API response (#1394)
Update health API response (#1394)

* add header to health api response

* Apply suggestions from code review

Co-Authored-By: apaskulin <60c6d277a8bd81de7fdde19201bf9c58a3df08f4@sensu.io>

sensu/sensu-docs,sensu/sensu-docs,sensu/sensu-docs,sensu/sensu-docs,sensu/sensu-docs