octokit.net/docs/enterprise-administration.md

GitHub Enterprise Administration

Octokit also ships with support for the administration APIs that GitHub Enterprise includes to script tasks for administrators.

var enterprise = new Uri("https://github.myenterprise.com/");
var github = new GitHubClient("some app name", enterprise);
github.Credentials = new Credentials("some-token-here");

var stats = await github.Enterprise.AdminStats.GetStatisticsUsers();
Console.WriteLine($"Found {stats.AdminUsers} admins, {stats.TotalUsers} total users and {stats.SuspendedUsers} suspended users");

Some caveats on using these APIs that you should be aware of:

• only administrators of the GitHub Enterprise instance are able to access these APIs
• administrators creating OAuth tokens to use this endpoint must ensure the site_admin scope is set
• the Management Console API also require providing the password created during setup of the GitHub Enterprise installation to confirm the action

You can read more about this support on the GitHub website.

Management console

To view the maintenance mode status of a GitHub Enteprise installation:

var maintenance = await github.Enterprise.ManagementConsole.GetMaintenanceMode("management-console-password");

To put the GitHub Enterprise installation into maintenance mode immediately:

var request = new UpdateMaintenanceRequest(new UpdateMaintenanceRequestDetails(true));
var maintenance = await github.Enterprise.ManagementConsole.EditMaintenanceMode(
  request,
  "management-console-password");

You can also provide a human-friendly phrase based on the rules in mojombo/chronic:

var request = new UpdateMaintenanceRequest(new UpdateMaintenanceRequestDetails(true, "tomorrow at 5pm"));
var maintenance = await github.Enterprise.ManagementConsole.EditMaintenanceMode(
  request,
  "management-console-password");

To put the GitHub Enterprise installation into maintenance mode after a period of time:

var scheduledTime = DateTimeOffset.Now.AddMinutes(10);
var request = new UpdateMaintenanceRequest(new UpdateMaintenanceRequestDetails(true, scheduledTime));
var maintenance = await github.Enterprise.ManagementConsole.EditMaintenanceMode(
  request,
  "management-console-password");

To disable maintenance mode, simple pass in false or leave the request constructor empty:

var maintenance = await github.Enterprise.ManagementConsole.EditMaintenanceMode(
  new UpdateMaintenanceRequest(), // off by default if nothing specified
  "management-console-password");