add 7.0 moniker (#26741)

aspnetcore/fundamentals/w3c-logger/index.md

@@ -4,12 +4,64 @@ author: wtgodbe
 description: Learn how to create server logs in the W3C standard format.
 monikerRange: '>= aspnetcore-6.0'
 ms.author: wigodbe
-ms.date: 01/21/2022
+ms.date: 08/15/2022
 uid: fundamentals/w3c-logger/index
 ---
 
 # W3CLogger in ASP.NET Core
 
+:::moniker range="= aspnetcore-6.0"
+
+W3CLogger is a middleware that writes log files in the [W3C standard format](https://www.w3.org/TR/WD-logfile.html). The logs contain information about HTTP requests and HTTP responses. W3CLogger provides logs of:
+
+* HTTP request information
+* Common properties
+* Headers
+* HTTP response information
+* Metadata about the request/response pair (date/time started, time taken)
+
+W3CLogger is valuable in several scenarios to:
+
+* Record information about incoming requests and responses.
+* Filter which parts of the request and response are logged.
+* Filter which headers to log.
+
+W3CLogger ***can reduce the performance of an app***. Consider the performance impact when selecting fields to log - the performance reduction will increase as you log more properties. Test the performance impact of the selected logging properties.
+
+> [!WARNING]
+> W3CLogger can potentially log personally identifiable information (PII). Consider the risk and avoid logging sensitive information. By default, fields that could contain PII aren't logged.
+
+## Enable W3CLogger
+
+Enable W3CLogger with <xref:Microsoft.AspNetCore.Builder.HttpLoggingBuilderExtensions.UseW3CLogging%2A>, which adds the W3CLogger middleware:
+
+:::code language="csharp" source="samples/6.x/Program.cs" id="snippet_UseW3CLogging" highlight="3":::
+
+By default, W3CLogger logs common properties such as path, status-code, date, time, and protocol. All information about a single request/response pair is written to the same line.
+
+```
+#Version: 1.0
+#Start-Date: 2021-09-29 22:18:28
+#Fields: date time c-ip s-computername s-ip s-port cs-method cs-uri-stem cs-uri-query sc-status time-taken cs-version cs-host cs(User-Agent) cs(Referer)
+2021-09-29 22:18:28 ::1 DESKTOP-LH3TLTA ::1 5000 GET / - 200 59.9171 HTTP/1.1 localhost:5000 Mozilla/5.0+(Windows+NT+10.0;+WOW64)+AppleWebKit/537.36+(KHTML,+like+Gecko)+Chrome/93.0.4577.82+Safari/537.36 -
+2021-09-29 22:18:28 ::1 DESKTOP-LH3TLTA ::1 5000 GET / - 200 0.1802 HTTP/1.1 localhost:5000 Mozilla/5.0+(Windows+NT+10.0;+WOW64)+AppleWebKit/537.36+(KHTML,+like+Gecko)+Chrome/93.0.4577.82+Safari/537.36 -
+2021-09-29 22:18:30 ::1 DESKTOP-LH3TLTA ::1 5000 GET / - 200 0.0966 HTTP/1.1 localhost:5000 Mozilla/5.0+(Windows+NT+10.0;+WOW64)+AppleWebKit/537.36+(KHTML,+like+Gecko)+Chrome/93.0.4577.82+Safari/537.36 -
+```
+
+## W3CLogger options
+
+To configure the W3CLogger middleware, call <xref:Microsoft.Extensions.DependencyInjection.HttpLoggingServicesExtensions.AddW3CLogging%2A> in `Program.cs`:
+
+:::code language="csharp" source="samples/6.x/Program.cs" id="snippet_AddW3CLogging" highlight="3":::
+
+### `LoggingFields`
+
+<xref:Microsoft.AspNetCore.HttpLogging.W3CLoggerOptions.LoggingFields%2A?displayProperty=nameWithType> is a bit flag enumeration that configures specific parts of the request and response to log, and other information about the connection. `LoggingFields` defaults to include all possible fields except `UserName` and `Cookie`. For a complete list of available fields, see <xref:Microsoft.AspNetCore.HttpLogging.W3CLoggingFields>.
+
+::: moniker-end
+
+:::moniker range=">= aspnetcore-7.0"
+
 W3CLogger is a middleware that writes log files in the [W3C standard format](https://www.w3.org/TR/WD-logfile.html). The logs contain information about HTTP requests and HTTP responses. W3CLogger provides logs of:
 
 * HTTP request information
@@ -55,3 +107,5 @@ To configure the W3CLogger middleware, call <xref:Microsoft.Extensions.Dependenc
 ### `LoggingFields`
 
 <xref:Microsoft.AspNetCore.HttpLogging.W3CLoggerOptions.LoggingFields%2A?displayProperty=nameWithType> is a bit flag enumeration that configures specific parts of the request and response to log, and other information about the connection. `LoggingFields` defaults to include all possible fields except `UserName` and `Cookie`. For a complete list of available fields, see <xref:Microsoft.AspNetCore.HttpLogging.W3CLoggingFields>.
+
+::: moniker-end