Refactor: Move obsolete message to private constant to avoid repetition

Author: neeraj542

src/OpenTelemetry.Extensions.Propagators/JaegerPropagator.cs

@@ -10,7 +10,7 @@ namespace OpenTelemetry.Extensions.Propagators;
 /// <summary>
 /// A text map propagator for Jaeger trace context. See https://www.jaegertracing.io/docs/next-release/client-libraries/#propagation-format.
 /// </summary>
-[Obsolete("The Jaeger propagator is obsolete and will be removed in a future version. The Jaeger propagation format has been deprecated in favor of W3C Trace Context. Use TraceContextPropagator instead. See https://www.jaegertracing.io/sdk-migration/#propagation-format and https://github.com/open-telemetry/opentelemetry-specification/issues/4827 for more information.")]
+[Obsolete(ObsoleteMessage)]
 public class JaegerPropagator : TextMapPropagator
 {
     internal const string JaegerHeader = "uber-trace-id";
@@ -20,6 +20,8 @@ public class JaegerPropagator : TextMapPropagator
 
     internal static readonly string[] JaegerDelimiters = [JaegerDelimiter, JaegerDelimiterEncoded];
 
+    private const string ObsoleteMessage = "The Jaeger propagator is obsolete and will be removed in a future version. The Jaeger propagation format has been deprecated in favor of W3C Trace Context. Use TraceContextPropagator instead. See https://www.jaegertracing.io/sdk-migration/#propagation-format and https://github.com/open-telemetry/opentelemetry-specification/issues/4827 for more information.";
+
     private static readonly int TraceId128BitLength = "0af7651916cd43dd8448eb211c80319c".Length;
     private static readonly int SpanIdLength = "00f067aa0ba902b7".Length;
 
@@ -29,7 +31,7 @@ public class JaegerPropagator : TextMapPropagator
 #pragma warning restore CS0809 // Obsolete member overrides non-obsolete member
 
     /// <inheritdoc/>
-    [Obsolete("The Jaeger propagator is obsolete and will be removed in a future version. The Jaeger propagation format has been deprecated in favor of W3C Trace Context. Use TraceContextPropagator instead. See https://www.jaegertracing.io/sdk-migration/#propagation-format and https://github.com/open-telemetry/opentelemetry-specification/issues/4827 for more information.")]
+    [Obsolete(ObsoleteMessage)]
 #pragma warning disable CS0809 // Obsolete member overrides non-obsolete member
     public override PropagationContext Extract<T>(PropagationContext context, T carrier, Func<T, string, IEnumerable<string>?> getter)
 #pragma warning restore CS0809 // Obsolete member overrides non-obsolete member
@@ -87,7 +89,7 @@ public override PropagationContext Extract<T>(PropagationContext context, T carr
     }
 
     /// <inheritdoc/>
-    [Obsolete("The Jaeger propagator is obsolete and will be removed in a future version. The Jaeger propagation format has been deprecated in favor of W3C Trace Context. Use TraceContextPropagator instead. See https://www.jaegertracing.io/sdk-migration/#propagation-format and https://github.com/open-telemetry/opentelemetry-specification/issues/4827 for more information.")]
+    [Obsolete(ObsoleteMessage)]
 #pragma warning disable CS0809 // Obsolete member overrides non-obsolete member
     public override void Inject<T>(PropagationContext context, T carrier, Action<T, string, string> setter)
 #pragma warning restore CS0809 // Obsolete member overrides non-obsolete member