Add column for default diagnostic severity

doc/analyzers/index.md

@@ -3,28 +3,28 @@
 The following are the diagnostic analyzers installed with the [Microsoft.VisualStudio.Threading.Analyzers][1]
 NuGet package.
 
-ID | Title | Severity | Supports
----- | --- | --- | --- |
-[VSTHRD001](VSTHRD001.md) | Avoid legacy thread switching methods | Critical | [1st rule](../threading_rules.md#Rule1)
-[VSTHRD002](VSTHRD002.md) | Avoid problematic synchronous waits | Critical | [2nd rule](../threading_rules.md#Rule2)
-[VSTHRD003](VSTHRD003.md) | Avoid awaiting foreign Tasks | Critical | [3rd rule](../threading_rules.md#Rule3)
-[VSTHRD004](VSTHRD004.md) | Await SwitchToMainThreadAsync | Critical | [1st rule](../threading_rules.md#Rule1)
-[VSTHRD010](VSTHRD010.md) | Invoke single-threaded types on Main thread | Critical | [1st rule](../threading_rules.md#Rule1)
-[VSTHRD011](VSTHRD011.md) | Use `AsyncLazy<T>` | Critical | [3rd rule](../threading_rules.md#Rule3)
-[VSTHRD012](VSTHRD012.md) | Provide JoinableTaskFactory where allowed | Critical | [All rules](../threading_rules.md)
-[VSTHRD100](VSTHRD100.md) | Avoid `async void` methods | Advisory
-[VSTHRD101](VSTHRD101.md) | Avoid unsupported async delegates | Advisory | [VSTHRD100](VSTHRD100.md)
-[VSTHRD102](VSTHRD102.md) | Implement internal logic asynchronously | Advisory | [2nd rule](../threading_rules.md#Rule2)
-[VSTHRD103](VSTHRD103.md) | Call async methods when in an async method | Advisory
-[VSTHRD104](VSTHRD104.md) | Offer async option | Advisory
-[VSTHRD105](VSTHRD105.md) | Avoid method overloads that assume `TaskScheduler.Current` | Advisory
-[VSTHRD106](VSTHRD106.md) | Use `InvokeAsync` to raise async events | Advisory
-[VSTHRD107](VSTHRD107.md) | Await Task within using expression | Advisory
-[VSTHRD108](VSTHRD108.md) | Assert thread affinity unconditionally | Advisory | [1st rule](../threading_rules.md#Rule1), [VSTHRD010](VSTHRD010.md)
-[VSTHRD109](VSTHRD109.md) | Switch instead of assert in async methods | Advisory | [1st rule](../threading_rules.md#Rule1)
-[VSTHRD110](VSTHRD110.md) | Observe result of async calls | Advisory
-[VSTHRD111](VSTHRD111.md) | Use `.ConfigureAwait(bool)` | Advisory
-[VSTHRD200](VSTHRD200.md) | Use `Async` naming convention | Guideline | [VSTHRD103](VSTHRD103.md)
+ID | Title | Severity | Supports | Default diagnostic severity
+---- | --- | --- | --- | --- |
+[VSTHRD001](VSTHRD001.md) | Avoid legacy thread switching methods | Critical | [1st rule](../threading_rules.md#Rule1) | 🔡 Warning
+[VSTHRD002](VSTHRD002.md) | Avoid problematic synchronous waits | Critical | [2nd rule](../threading_rules.md#Rule2) | Warning
+[VSTHRD003](VSTHRD003.md) | Avoid awaiting foreign Tasks | Critical | [3rd rule](../threading_rules.md#Rule3) | Warning
+[VSTHRD004](VSTHRD004.md) | Await SwitchToMainThreadAsync | Critical | [1st rule](../threading_rules.md#Rule1) | Error
+[VSTHRD010](VSTHRD010.md) | Invoke single-threaded types on Main thread | Critical | [1st rule](../threading_rules.md#Rule1) | Warning
+[VSTHRD011](VSTHRD011.md) | Use `AsyncLazy<T>` | Critical | [3rd rule](../threading_rules.md#Rule3) | Error
+[VSTHRD012](VSTHRD012.md) | Provide JoinableTaskFactory where allowed | Critical | [All rules](../threading_rules.md) | Warning
+[VSTHRD100](VSTHRD100.md) | Avoid `async void` methods | Advisory | | Warning
+[VSTHRD101](VSTHRD101.md) | Avoid unsupported async delegates | Advisory | [VSTHRD100](VSTHRD100.md) | Warning
+[VSTHRD102](VSTHRD102.md) | Implement internal logic asynchronously | Advisory | [2nd rule](../threading_rules.md#Rule2) | Info
+[VSTHRD103](VSTHRD103.md) | Call async methods when in an async method | Advisory | | Warning
+[VSTHRD104](VSTHRD104.md) | Offer async option | Advisory | | Info
+[VSTHRD105](VSTHRD105.md) | Avoid method overloads that assume `TaskScheduler.Current` | Advisory | | Warning
+[VSTHRD106](VSTHRD106.md) | Use `InvokeAsync` to raise async events | Advisory | | Warning
+[VSTHRD107](VSTHRD107.md) | Await Task within using expression | Advisory | | Error
+[VSTHRD108](VSTHRD108.md) | Assert thread affinity unconditionally | Advisory | [1st rule](../threading_rules.md#Rule1), [VSTHRD010](VSTHRD010.md) | Warning
+[VSTHRD109](VSTHRD109.md) | Switch instead of assert in async methods | Advisory | [1st rule](../threading_rules.md#Rule1) | Error
+[VSTHRD110](VSTHRD110.md) | Observe result of async calls | Advisory | | Warning
+[VSTHRD111](VSTHRD111.md) | Use `.ConfigureAwait(bool)` | Advisory | | Hidden
+[VSTHRD200](VSTHRD200.md) | Use `Async` naming convention | Guideline | [VSTHRD103](VSTHRD103.md) | Warning
 
 ## Severity descriptions
 
@@ -34,6 +34,12 @@ Critical  | 1-99    | Code issues that often result in deadlocks
 Advisory  | 100-199 | Code that may perform differently than intended or lead to occasional deadlocks
 Guideline | 200-299 | Code that deviates from best practices and may limit the benefits of other analyzers
 
+## Default diagnostic severity legend
+
+| Icon | Meaning |
+| ---- | ------- |
+| 🔡 | The analyzer only produces diagnostics when configured.
+
 ## Configuration
 
 Some analyzers' behavior can be configured. See our [configuration](configuration.md) topic for more information.