Returns 200 if healthy.
  GET /health     
 GET
 /health
 Responses
200
(empty)
A health check response.
object
 data    
 object
 db-available 
 required
   boolean
  errors    
 Array<string>
  is-migrating 
 required
   boolean
  message 
 required
   string
  round 
 required
   integer
  version 
 required
   Current version.
string
 default
Unknown Error