Add process uptime to host status api

Author: ahmelsayed

src/WebJobs.Script.WebHost/Controllers/HostController.cs

@@ -75,7 +75,8 @@ public async Task<IActionResult> GetHostStatus([FromServices] IScriptHostManager
                 State = scriptHostManager.State.ToString(),
                 Version = ScriptHost.Version,
                 VersionDetails = Utility.GetInformationalVersion(typeof(ScriptHost)),
-                Id = await hostIdProvider.GetHostIdAsync(CancellationToken.None)
+                Id = await hostIdProvider.GetHostIdAsync(CancellationToken.None),
+                ProcessUptime = (long)(DateTime.UtcNow - Process.GetCurrentProcess().StartTime).TotalMilliseconds
             };
 
             var lastError = scriptHostManager.LastError;

src/WebJobs.Script.WebHost/Models/HostStatus.cs

@@ -1,6 +1,7 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the MIT License. See License.txt in the project root for license information.
 
+using System;
 using System.Collections.ObjectModel;
 using Newtonsoft.Json;
 
@@ -37,5 +38,11 @@ public class HostStatus
         /// </summary>
         [JsonProperty(PropertyName = "errors", DefaultValueHandling = DefaultValueHandling.Ignore)]
         public Collection<string> Errors { get; set; }
+
+        /// <summary>
+        /// Gets or sets the uptime of the process
+        /// </summary>
+        [JsonProperty(PropertyName = "processUptime", DefaultValueHandling = DefaultValueHandling.Ignore)]
+        public long ProcessUptime { get; set; }
     }
 }