system.users 采集

{
  _id: <system defined id>,
  userId : <system assigned UUID>,  // Starting in MongoDB 4.0.9
  user: "<name>",
  db: "<database>",
  credentials: { <authentication credentials> },
  roles: [
           { role: "<role name>", db: "<database>" },
           ...
         ],
  customData: <custom information>,
  authenticationRestrictions : [ <documents> ] // Starting in MongoDB 4.0
 }

{
   "_id" : "home.Kari",
   "userId" : UUID("ec1eced7-055a-4ca8-8737-60dd02c52793"),  // Available starting in MongoDB 4.0.9
   "user" : "Kari",
   "db" : "home",
   "credentials" : {
      "SCRAM-SHA-1" : {
         "iterationCount" : 10000,
         "salt" : "S/xM2yXFosynbCu4GzFDgQ==",
         "storedKey" : "Ist4cgpEd1vTbnRnQLdobgmOsBA=",
         "serverKey" : "e/0DyzS6GPboAA2YNBkGYm87+cg="
      },
      "SCRAM-SHA-256" : {
         "iterationCount" : 15000,
         "salt" : "p1G+fZadAeYAbECN8F/6TMzXGYWBaZ3DtWM0ig==",
         "storedKey" : "LEgLOqZQmkGhd0owm/+6V7VdJUYJcXBhPUvi9z+GBfk=",
         "serverKey" : "JKfnkVv9iXwxyc8JaapKVwLPy6SfnmB8gMb1Pr15T+s="
      }
   },
   "authenticationRestrictions" : [                           // Available starting in MongoDB 4.0
      { "clientSource" : [ "69.89.31.226" ], "serverAddress" : [ "172.16.254.1" ] }
   ],
   "customData" : {
      "zipCode" : "64157"
   },
   "roles" : [
      {
         "role" : "read",
         "db" : "home"
      },
      {
         "role" : "readWrite",
         "db" : "test"
      }
   ]
}