Deprecate metro code

MaxMind.GeoIP2.UnitTests/DatabaseReaderTests.cs

@@ -282,7 +282,9 @@ public void City_ManyFields()
 
             Assert.Equal(47.2513, response.Location.Latitude);
             Assert.Equal(-122.3149, response.Location.Longitude);
+#pragma warning disable 0618
             Assert.Equal(819, response.Location.MetroCode);
+#pragma warning restore 0618
             Assert.Equal("America/Los_Angeles", response.Location.TimeZone);
 
             Assert.Equal("98354", response.Postal.Code);

MaxMind.GeoIP2.UnitTests/DeserializationTests.cs

@@ -58,7 +58,9 @@ private static void CanDeserializeInsightsResponse(InsightsResponse insights)
             Assert.Equal(1500, insights.Location.AccuracyRadius);
             Assert.Equal(44.979999999999997, insights.Location.Latitude);
             Assert.Equal(93.263599999999997, insights.Location.Longitude);
+#pragma warning disable 0618
             Assert.Equal(765, insights.Location.MetroCode);
+#pragma warning restore 0618
             Assert.Equal("America/Chicago", insights.Location.TimeZone);
             Assert.Equal(50000, insights.Location.AverageIncome);
             Assert.Equal(100, insights.Location.PopulationDensity);

MaxMind.GeoIP2.UnitTests/WebServiceClientTests.cs

@@ -362,7 +362,9 @@ public void MissingKeys()
             Assert.Null(location.AccuracyRadius);
             Assert.Null(location.Latitude);
             Assert.Null(location.Longitude);
+#pragma warning disable 618
             Assert.Null(location.MetroCode);
+#pragma warning restore 618
             Assert.Null(location.TimeZone);
             Assert.Null(location.PopulationDensity);
             Assert.Null(location.AverageIncome);

MaxMind.GeoIP2/Model/Location.cs

@@ -1,6 +1,7 @@
 #region
 
 using MaxMind.Db;
+using System;
 using System.Text.Json.Serialization;
 
 #endregion
@@ -33,7 +34,9 @@ public Location(
             AccuracyRadius = accuracyRadius;
             Latitude = latitude;
             Longitude = longitude;
+#pragma warning disable 618
             MetroCode = metroCode;
+#pragma warning restore 618
             TimeZone = timeZone;
         }
 
@@ -81,12 +84,12 @@ public Location(
         public double? Longitude { get; internal set; }
 
         /// <summary>
-        ///     The metro code of the location if the location is in the US.
-        ///     MaxMind returns the same metro codes as the
-        ///     <a href="https://developers.google.com/adwords/api/docs/appendix/cities-DMAregions">Google AdWords API</a>.
+        ///     The metro code is a no-longer-maintained code for targeting
+        ///     advertisements in Google.
         /// </summary>
         [JsonInclude]
         [JsonPropertyName("metro_code")]
+        [Obsolete("Code values are no longer maintained.")]
         public int? MetroCode { get; internal set; }
 
         /// <summary>
@@ -121,7 +124,9 @@ public override string ToString()
                    + (AccuracyRadius.HasValue ? "AccuracyRadius=" + AccuracyRadius + ", " : string.Empty)
                    + (Latitude.HasValue ? "Latitude=" + Latitude + ", " : string.Empty)
                    + (Longitude.HasValue ? "Longitude=" + Longitude + ", " : string.Empty)
+#pragma warning disable 618
                    + (MetroCode.HasValue ? "MetroCode=" + MetroCode + ", " : string.Empty)
+#pragma warning restore 618
                    + (TimeZone != null ? "TimeZone=" + TimeZone : "") + "]";
         }
     }

releasenotes.md

@@ -8,6 +8,8 @@ GeoIP2 .NET API Release Notes
   reach their end of support from Microsoft. If you are using these versions,
   the .NET Standard 2.1 target should continue working for you.
 * .NET 9.0 has been added as a target.
+* `MetroCode` in `MaxMind.GeoIP2.Model.Location` has been marked `Obsolete`.
+  The code values are no longer being maintained.
 
 5.2.0 (2023-12-05)
 ------------------