ping

/admin/datastore?op=ping checks the aliveness of a Dgraph and returns a lightweight message.

You can view the Dgraph Statistics page to check whether the Dgraph is running and accepting queries, but that comes with some overhead. A quicker way to check the aliveness of a Dgraph is by running the ping command.

Because ping requests are given the highest priority and are processed synchronously (as they are received), a ping response time is independent of the number of outstanding requests in the Dgraph.

The ping command returns a lightweight page that lists the Dgraph process, the current date and time, such as the following:
dgraph Web07:5556 responding at Wed Mar 28 15:35:27 2012
You can use this operation to monitor the health or heartbeat of the Dgraph, and as a health check for load balancers.