Synchronize KestrelTrace next-id comments (#49964)

* Synchronize KestrelTrace next-id comments

* Make comment self-documenting

* Update comments to reflect that KestrelTrace has split into separate loggers

Author: amcasey

src/Servers/Kestrel/Core/src/Internal/Infrastructure/KestrelTrace.BadRequests.cs

@@ -53,6 +53,6 @@ private static partial class BadRequestsLog
         [LoggerMessage(54, LogLevel.Debug, @"Connection id ""{ConnectionId}"": Invalid content received on connection. Possible incorrect HTTP version detected. Expected {ExpectedHttpVersion} but received {DetectedHttpVersion}.", EventName = "PossibleInvalidHttpVersionDetected", SkipEnabledCheck = true)]
         public static partial void PossibleInvalidHttpVersionDetected(ILogger logger, string connectionId, string expectedHttpVersion, string detectedHttpVersion);
 
-        // Highest shared ID is 63. New consecutive IDs start at 64
+        // IDs prior to 64 are reserved for back compat (the various KestrelTrace loggers used to share a single sequence)
     }
 }

src/Servers/Kestrel/Core/src/Internal/Infrastructure/KestrelTrace.Connections.cs

@@ -97,6 +97,6 @@ private static partial class ConnectionsLog
         [LoggerMessage(39, LogLevel.Debug, @"Connection id ""{ConnectionId}"" accepted.", EventName = "ConnectionAccepted")]
         public static partial void ConnectionAccepted(ILogger logger, string connectionId);
 
-        // Highest shared ID is 63. New consecutive IDs start at 64
+        // IDs prior to 64 are reserved for back compat (the various KestrelTrace loggers used to share a single sequence)
     }
 }

src/Servers/Kestrel/Core/src/Internal/Infrastructure/KestrelTrace.General.cs

@@ -107,6 +107,6 @@ private static partial class GeneralLog
         [LoggerMessage(66, LogLevel.Debug, @"Connection id ""{ConnectionId}"", Request id ""{TraceIdentifier}"": The request was aborted by the client.", EventName = "RequestAborted")]
         public static partial void RequestAbortedException(ILogger logger, string connectionId, string traceIdentifier);
 
-        // Highest shared ID is 66. New consecutive IDs start at 67
+        // IDs prior to 64 are reserved for back compat (the various KestrelTrace loggers used to share a single sequence)
     }
 }

src/Servers/Kestrel/Core/src/Internal/Infrastructure/KestrelTrace.Http2.cs

@@ -129,6 +129,6 @@ private static partial class Http2Log
         [LoggerMessage(63, LogLevel.Critical, @"The event loop in connection {ConnectionId} failed unexpectedly.", EventName = "Http2UnexpectedConnectionQueueError")]
         public static partial void Http2UnexpectedConnectionQueueError(ILogger logger, string connectionId, Exception ex);
 
-        // Highest shared ID is 63. New consecutive IDs start at 64
+        // IDs prior to 64 are reserved for back compat (the various KestrelTrace loggers used to share a single sequence)
     }
 }

src/Servers/Kestrel/Core/src/Internal/Infrastructure/KestrelTrace.Http3.cs

@@ -101,6 +101,6 @@ private static partial class Http3Log
         [LoggerMessage(53, LogLevel.Debug, @"Connection id ""{ConnectionId}"": GOAWAY stream ID {GoAwayStreamId}.", EventName = "Http3GoAwayHighestOpenedStreamId")]
         public static partial void Http3GoAwayStreamId(ILogger logger, string connectionId, long goAwayStreamId);
 
-        // Highest shared ID is 63. New consecutive IDs start at 64
+        // IDs prior to 64 are reserved for back compat (the various KestrelTrace loggers used to share a single sequence)
     }
 }