Observe your system

FCQRS gives you the command → event → saga story two ways out of the box: a plain-text message-flow log that needs no setup, and distributed traces that plug into OpenTelemetry. Both are on the standard .NET abstractions (ILogger, ActivitySource), so they flow through whatever you already use. This guide covers what you get, how to tune it, and how to keep sensitive data out.

The message-flow log (on by default)

FCQRS narrates every message at Information level — no tracing pipeline required. Each aggregate command logs the effect it yielded, each persisted event logs its new version, and sagas log every event they pick up, every state transition, and every command they send (with target and delay). Every line carries the correlation ID, so grepping one CID replays a whole workflow:

info: FCQRS.MessageFlow
      Command Register ("alice", "pw") to aggregate alice (v0) yielded PersistEvent (VerificationRequested ...) [cid: 00-...]
info: FCQRS.MessageFlow
      Aggregate alice persisted event VerificationRequested ("alice", "pw") (v1) [cid: 00-...]
info: FCQRS.MessageFlow
      Saga alice~Saga~00-... received VerificationRequested ("alice", "pw"), decided StateChangedEvent (UserDefined GeneratingCode) [cid: 00-...]
info: FCQRS.MessageFlow
      Saga alice~Saga~00-... changed state to GeneratingCode [cid: 00-...]
info: FCQRS.MessageFlow
      Saga alice~Saga~00-... sent command SetVerificationCode "327470" to alice [cid: 00-...]

These are your application's messages, not FCQRS internals, so the switch lives in FCQRS — turn it off process-wide with FCQRS.Common.Telemetry.MessageFlowLogging <- false, or from the C# hosting builder with builder.WithMessageFlowLogging(false). Every line goes to the dedicated FCQRS.MessageFlow logger category, so standard log filtering also works — e.g. "Logging:LogLevel:FCQRS.MessageFlow": "None" in appsettings.json. When the category is filtered out (or the switch is off) the lines are never even formatted, so it costs nothing.

Distributed traces

Aggregates, sagas, and the projection each emit through an ActivitySource, and spans parent onto whatever trace was current when the command was created (the W3C traceparent rides the command's metadata through the whole flow). Register all three sources with your OpenTelemetry pipeline in one call:

tracing.AddSource(FCQRS.Common.Telemetry.AllActivitySources); // "FCQRS", "FCQRS.Saga", "FCQRS.Query"

Spans cost nothing until a listener is attached, so leaving this unwired is free. Restart-detection aborts and fatal errors light up as Error-status spans, so failed flows are findable without tag filters.

Span names are low-cardinality

Span names are the case name only — Command:Register, Event:Registered, Saga:GeneratingCode, Abort:VerificationRequested — never the payload values. That is deliberate: it lets trace viewers group and compute latency by operation, and on .NET 11 it lets the rule-based AddTracing API enable or disable a specific FCQRS operation from configuration, no redeploy:

builder.Services.AddTracing(tracing =>
{
    tracing.EnableTracing(sourceName: "FCQRS.Saga");
    tracing.DisableTracing(sourceName: "FCQRS", operationName: "Command:HealthPing");
});

It also means no payload value is ever written into an indexed span name.

Keep payloads out of diagnostics

The full rendered payload rides in the span tags (command.type / event.type) and in the message-flow log lines, and is on by default — the detail that makes the flow log useful in development. For sensitive domains, turn it off:

FCQRS.Common.Telemetry.IncludePayloads <- false   // or builder.WithPayloadDiagnostics(false)

Tags and log lines then carry the case name only, matching the span name. Span names are low-cardinality regardless of this switch, so tracing rules and grouping are unaffected either way. (Best practice still applies: don't put secrets in command/event fields — an event journal keeps them forever. This switch protects the diagnostics surface, not the journal.)

Flush telemetry on a fatal exit

On an unrecoverable inconsistency (a fold or handler that throws) FCQRS fail-fasts the process to avoid silent state divergence — which skips finalizers, so anything still buffered in a batch span exporter or log sink is lost, including the fatal flow's own span. Give it a flush hook to drain your pipeline first:

FCQRS.Common.Telemetry.FatalFlush <- System.Action(fun () ->
    tracerProvider.ForceFlush(3000) |> ignore
    loggerProvider.ForceFlush(3000) |> ignore) // or Serilog's Log.CloseAndFlush()

It runs on a background thread with a 5-second cap, so a hung exporter can't block the kill.

Akka's own logging

Akka.NET's internal logging ships off (it is chatty); FCQRS's own logs go through your ILoggerFactory regardless. To see Akka internals, use builder.WithAkkaLogging(AkkaLogLevel.Info) from the hosting builder, or set config:akka:loglevel in configuration. See Configuration for the config-key details.

namespace System

Multiple items
type Action<'T1,'T2,'T3,'T4,'T5,'T6,'T7,'T8,'T9,'T10,'T11,'T12,'T13,'T14,'T15,'T16> = new: object: obj * method: nativeint -> unit member BeginInvoke: arg1: 'T1 * arg2: 'T2 * arg3: 'T3 * arg4: 'T4 * arg5: 'T5 * arg6: 'T6 * arg7: 'T7 * arg8: 'T8 * arg9: 'T9 * arg10: 'T10 * arg11: 'T11 * arg12: 'T12 * arg13: 'T13 * arg14: 'T14 * arg15: 'T15 * arg16: 'T16 * callback: AsyncCallback * object: obj -> IAsyncResult member EndInvoke: result: IAsyncResult -> unit member Invoke: arg1: 'T1 * arg2: 'T2 * arg3: 'T3 * arg4: 'T4 * arg5: 'T5 * arg6: 'T6 * arg7: 'T7 * arg8: 'T8 * arg9: 'T9 * arg10: 'T10 * arg11: 'T11 * arg12: 'T12 * arg13: 'T13 * arg14: 'T14 * arg15: 'T15 * arg16: 'T16 -> unit
<summary>Encapsulates a method that has 16 parameters and does not return a value.</summary>
<param name="arg1">The first parameter of the method that this delegate encapsulates.</param>
<param name="arg2">The second parameter of the method that this delegate encapsulates.</param>
<param name="arg3">The third parameter of the method that this delegate encapsulates.</param>
<param name="arg4">The fourth parameter of the method that this delegate encapsulates.</param>
<param name="arg5">The fifth parameter of the method that this delegate encapsulates.</param>
<param name="arg6">The sixth parameter of the method that this delegate encapsulates.</param>
<param name="arg7">The seventh parameter of the method that this delegate encapsulates.</param>
<param name="arg8">The eighth parameter of the method that this delegate encapsulates.</param>
<param name="arg9">The ninth parameter of the method that this delegate encapsulates.</param>
<param name="arg10">The tenth parameter of the method that this delegate encapsulates.</param>
<param name="arg11">The eleventh parameter of the method that this delegate encapsulates.</param>
<param name="arg12">The twelfth parameter of the method that this delegate encapsulates.</param>
<param name="arg13">The thirteenth parameter of the method that this delegate encapsulates.</param>
<param name="arg14">The fourteenth parameter of the method that this delegate encapsulates.</param>
<param name="arg15">The fifteenth parameter of the method that this delegate encapsulates.</param>
<param name="arg16">The sixteenth parameter of the method that this delegate encapsulates.</param>
<typeparam name="T1">The type of the first parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T2">The type of the second parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T3">The type of the third parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T4">The type of the fourth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T5">The type of the fifth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T6">The type of the sixth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T7">The type of the seventh parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T8">The type of the eighth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T9">The type of the ninth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T10">The type of the tenth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T11">The type of the eleventh parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T12">The type of the twelfth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T13">The type of the thirteenth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T14">The type of the fourteenth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T15">The type of the fifteenth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T16">The type of the sixteenth parameter of the method that this delegate encapsulates.</typeparam>

--------------------
type Action<'T1,'T2,'T3,'T4,'T5,'T6,'T7,'T8,'T9,'T10,'T11,'T12,'T13,'T14,'T15> = new: object: obj * method: nativeint -> unit member BeginInvoke: arg1: 'T1 * arg2: 'T2 * arg3: 'T3 * arg4: 'T4 * arg5: 'T5 * arg6: 'T6 * arg7: 'T7 * arg8: 'T8 * arg9: 'T9 * arg10: 'T10 * arg11: 'T11 * arg12: 'T12 * arg13: 'T13 * arg14: 'T14 * arg15: 'T15 * callback: AsyncCallback * object: obj -> IAsyncResult member EndInvoke: result: IAsyncResult -> unit member Invoke: arg1: 'T1 * arg2: 'T2 * arg3: 'T3 * arg4: 'T4 * arg5: 'T5 * arg6: 'T6 * arg7: 'T7 * arg8: 'T8 * arg9: 'T9 * arg10: 'T10 * arg11: 'T11 * arg12: 'T12 * arg13: 'T13 * arg14: 'T14 * arg15: 'T15 -> unit
<summary>Encapsulates a method that has 15 parameters and does not return a value.</summary>
<param name="arg1">The first parameter of the method that this delegate encapsulates.</param>
<param name="arg2">The second parameter of the method that this delegate encapsulates.</param>
<param name="arg3">The third parameter of the method that this delegate encapsulates.</param>
<param name="arg4">The fourth parameter of the method that this delegate encapsulates.</param>
<param name="arg5">The fifth parameter of the method that this delegate encapsulates.</param>
<param name="arg6">The sixth parameter of the method that this delegate encapsulates.</param>
<param name="arg7">The seventh parameter of the method that this delegate encapsulates.</param>
<param name="arg8">The eighth parameter of the method that this delegate encapsulates.</param>
<param name="arg9">The ninth parameter of the method that this delegate encapsulates.</param>
<param name="arg10">The tenth parameter of the method that this delegate encapsulates.</param>
<param name="arg11">The eleventh parameter of the method that this delegate encapsulates.</param>
<param name="arg12">The twelfth parameter of the method that this delegate encapsulates.</param>
<param name="arg13">The thirteenth parameter of the method that this delegate encapsulates.</param>
<param name="arg14">The fourteenth parameter of the method that this delegate encapsulates.</param>
<param name="arg15">The fifteenth parameter of the method that this delegate encapsulates.</param>
<typeparam name="T1">The type of the first parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T2">The type of the second parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T3">The type of the third parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T4">The type of the fourth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T5">The type of the fifth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T6">The type of the sixth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T7">The type of the seventh parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T8">The type of the eighth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T9">The type of the ninth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T10">The type of the tenth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T11">The type of the eleventh parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T12">The type of the twelfth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T13">The type of the thirteenth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T14">The type of the fourteenth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T15">The type of the fifteenth parameter of the method that this delegate encapsulates.</typeparam>

--------------------
type Action<'T1,'T2,'T3,'T4,'T5,'T6,'T7,'T8,'T9,'T10,'T11,'T12,'T13,'T14> = new: object: obj * method: nativeint -> unit member BeginInvoke: arg1: 'T1 * arg2: 'T2 * arg3: 'T3 * arg4: 'T4 * arg5: 'T5 * arg6: 'T6 * arg7: 'T7 * arg8: 'T8 * arg9: 'T9 * arg10: 'T10 * arg11: 'T11 * arg12: 'T12 * arg13: 'T13 * arg14: 'T14 * callback: AsyncCallback * object: obj -> IAsyncResult member EndInvoke: result: IAsyncResult -> unit member Invoke: arg1: 'T1 * arg2: 'T2 * arg3: 'T3 * arg4: 'T4 * arg5: 'T5 * arg6: 'T6 * arg7: 'T7 * arg8: 'T8 * arg9: 'T9 * arg10: 'T10 * arg11: 'T11 * arg12: 'T12 * arg13: 'T13 * arg14: 'T14 -> unit
<summary>Encapsulates a method that has 14 parameters and does not return a value.</summary>
<param name="arg1">The first parameter of the method that this delegate encapsulates.</param>
<param name="arg2">The second parameter of the method that this delegate encapsulates.</param>
<param name="arg3">The third parameter of the method that this delegate encapsulates.</param>
<param name="arg4">The fourth parameter of the method that this delegate encapsulates.</param>
<param name="arg5">The fifth parameter of the method that this delegate encapsulates.</param>
<param name="arg6">The sixth parameter of the method that this delegate encapsulates.</param>
<param name="arg7">The seventh parameter of the method that this delegate encapsulates.</param>
<param name="arg8">The eighth parameter of the method that this delegate encapsulates.</param>
<param name="arg9">The ninth parameter of the method that this delegate encapsulates.</param>
<param name="arg10">The tenth parameter of the method that this delegate encapsulates.</param>
<param name="arg11">The eleventh parameter of the method that this delegate encapsulates.</param>
<param name="arg12">The twelfth parameter of the method that this delegate encapsulates.</param>
<param name="arg13">The thirteenth parameter of the method that this delegate encapsulates.</param>
<param name="arg14">The fourteenth parameter of the method that this delegate encapsulates.</param>
<typeparam name="T1">The type of the first parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T2">The type of the second parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T3">The type of the third parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T4">The type of the fourth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T5">The type of the fifth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T6">The type of the sixth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T7">The type of the seventh parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T8">The type of the eighth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T9">The type of the ninth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T10">The type of the tenth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T11">The type of the eleventh parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T12">The type of the twelfth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T13">The type of the thirteenth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T14">The type of the fourteenth parameter of the method that this delegate encapsulates.</typeparam>

--------------------
type Action<'T1,'T2,'T3,'T4,'T5,'T6,'T7,'T8,'T9,'T10,'T11,'T12,'T13> = new: object: obj * method: nativeint -> unit member BeginInvoke: arg1: 'T1 * arg2: 'T2 * arg3: 'T3 * arg4: 'T4 * arg5: 'T5 * arg6: 'T6 * arg7: 'T7 * arg8: 'T8 * arg9: 'T9 * arg10: 'T10 * arg11: 'T11 * arg12: 'T12 * arg13: 'T13 * callback: AsyncCallback * object: obj -> IAsyncResult member EndInvoke: result: IAsyncResult -> unit member Invoke: arg1: 'T1 * arg2: 'T2 * arg3: 'T3 * arg4: 'T4 * arg5: 'T5 * arg6: 'T6 * arg7: 'T7 * arg8: 'T8 * arg9: 'T9 * arg10: 'T10 * arg11: 'T11 * arg12: 'T12 * arg13: 'T13 -> unit
<summary>Encapsulates a method that has 13 parameters and does not return a value.</summary>
<param name="arg1">The first parameter of the method that this delegate encapsulates.</param>
<param name="arg2">The second parameter of the method that this delegate encapsulates.</param>
<param name="arg3">The third parameter of the method that this delegate encapsulates.</param>
<param name="arg4">The fourth parameter of the method that this delegate encapsulates.</param>
<param name="arg5">The fifth parameter of the method that this delegate encapsulates.</param>
<param name="arg6">The sixth parameter of the method that this delegate encapsulates.</param>
<param name="arg7">The seventh parameter of the method that this delegate encapsulates.</param>
<param name="arg8">The eighth parameter of the method that this delegate encapsulates.</param>
<param name="arg9">The ninth parameter of the method that this delegate encapsulates.</param>
<param name="arg10">The tenth parameter of the method that this delegate encapsulates.</param>
<param name="arg11">The eleventh parameter of the method that this delegate encapsulates.</param>
<param name="arg12">The twelfth parameter of the method that this delegate encapsulates.</param>
<param name="arg13">The thirteenth parameter of the method that this delegate encapsulates.</param>
<typeparam name="T1">The type of the first parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T2">The type of the second parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T3">The type of the third parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T4">The type of the fourth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T5">The type of the fifth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T6">The type of the sixth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T7">The type of the seventh parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T8">The type of the eighth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T9">The type of the ninth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T10">The type of the tenth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T11">The type of the eleventh parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T12">The type of the twelfth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T13">The type of the thirteenth parameter of the method that this delegate encapsulates.</typeparam>

--------------------
type Action<'T1,'T2,'T3,'T4,'T5,'T6,'T7,'T8,'T9,'T10,'T11,'T12> = new: object: obj * method: nativeint -> unit member BeginInvoke: arg1: 'T1 * arg2: 'T2 * arg3: 'T3 * arg4: 'T4 * arg5: 'T5 * arg6: 'T6 * arg7: 'T7 * arg8: 'T8 * arg9: 'T9 * arg10: 'T10 * arg11: 'T11 * arg12: 'T12 * callback: AsyncCallback * object: obj -> IAsyncResult member EndInvoke: result: IAsyncResult -> unit member Invoke: arg1: 'T1 * arg2: 'T2 * arg3: 'T3 * arg4: 'T4 * arg5: 'T5 * arg6: 'T6 * arg7: 'T7 * arg8: 'T8 * arg9: 'T9 * arg10: 'T10 * arg11: 'T11 * arg12: 'T12 -> unit
<summary>Encapsulates a method that has 12 parameters and does not return a value.</summary>
<param name="arg1">The first parameter of the method that this delegate encapsulates.</param>
<param name="arg2">The second parameter of the method that this delegate encapsulates.</param>
<param name="arg3">The third parameter of the method that this delegate encapsulates.</param>
<param name="arg4">The fourth parameter of the method that this delegate encapsulates.</param>
<param name="arg5">The fifth parameter of the method that this delegate encapsulates.</param>
<param name="arg6">The sixth parameter of the method that this delegate encapsulates.</param>
<param name="arg7">The seventh parameter of the method that this delegate encapsulates.</param>
<param name="arg8">The eighth parameter of the method that this delegate encapsulates.</param>
<param name="arg9">The ninth parameter of the method that this delegate encapsulates.</param>
<param name="arg10">The tenth parameter of the method that this delegate encapsulates.</param>
<param name="arg11">The eleventh parameter of the method that this delegate encapsulates.</param>
<param name="arg12">The twelfth parameter of the method that this delegate encapsulates.</param>
<typeparam name="T1">The type of the first parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T2">The type of the second parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T3">The type of the third parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T4">The type of the fourth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T5">The type of the fifth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T6">The type of the sixth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T7">The type of the seventh parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T8">The type of the eighth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T9">The type of the ninth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T10">The type of the tenth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T11">The type of the eleventh parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T12">The type of the twelfth parameter of the method that this delegate encapsulates.</typeparam>

--------------------
type Action<'T1,'T2,'T3,'T4,'T5,'T6,'T7,'T8,'T9,'T10,'T11> = new: object: obj * method: nativeint -> unit member BeginInvoke: arg1: 'T1 * arg2: 'T2 * arg3: 'T3 * arg4: 'T4 * arg5: 'T5 * arg6: 'T6 * arg7: 'T7 * arg8: 'T8 * arg9: 'T9 * arg10: 'T10 * arg11: 'T11 * callback: AsyncCallback * object: obj -> IAsyncResult member EndInvoke: result: IAsyncResult -> unit member Invoke: arg1: 'T1 * arg2: 'T2 * arg3: 'T3 * arg4: 'T4 * arg5: 'T5 * arg6: 'T6 * arg7: 'T7 * arg8: 'T8 * arg9: 'T9 * arg10: 'T10 * arg11: 'T11 -> unit
<summary>Encapsulates a method that has 11 parameters and does not return a value.</summary>
<param name="arg1">The first parameter of the method that this delegate encapsulates.</param>
<param name="arg2">The second parameter of the method that this delegate encapsulates.</param>
<param name="arg3">The third parameter of the method that this delegate encapsulates.</param>
<param name="arg4">The fourth parameter of the method that this delegate encapsulates.</param>
<param name="arg5">The fifth parameter of the method that this delegate encapsulates.</param>
<param name="arg6">The sixth parameter of the method that this delegate encapsulates.</param>
<param name="arg7">The seventh parameter of the method that this delegate encapsulates.</param>
<param name="arg8">The eighth parameter of the method that this delegate encapsulates.</param>
<param name="arg9">The ninth parameter of the method that this delegate encapsulates.</param>
<param name="arg10">The tenth parameter of the method that this delegate encapsulates.</param>
<param name="arg11">The eleventh parameter of the method that this delegate encapsulates.</param>
<typeparam name="T1">The type of the first parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T2">The type of the second parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T3">The type of the third parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T4">The type of the fourth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T5">The type of the fifth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T6">The type of the sixth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T7">The type of the seventh parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T8">The type of the eighth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T9">The type of the ninth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T10">The type of the tenth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T11">The type of the eleventh parameter of the method that this delegate encapsulates.</typeparam>

--------------------
type Action<'T1,'T2,'T3,'T4,'T5,'T6,'T7,'T8,'T9,'T10> = new: object: obj * method: nativeint -> unit member BeginInvoke: arg1: 'T1 * arg2: 'T2 * arg3: 'T3 * arg4: 'T4 * arg5: 'T5 * arg6: 'T6 * arg7: 'T7 * arg8: 'T8 * arg9: 'T9 * arg10: 'T10 * callback: AsyncCallback * object: obj -> IAsyncResult member EndInvoke: result: IAsyncResult -> unit member Invoke: arg1: 'T1 * arg2: 'T2 * arg3: 'T3 * arg4: 'T4 * arg5: 'T5 * arg6: 'T6 * arg7: 'T7 * arg8: 'T8 * arg9: 'T9 * arg10: 'T10 -> unit
<summary>Encapsulates a method that has 10 parameters and does not return a value.</summary>
<param name="arg1">The first parameter of the method that this delegate encapsulates.</param>
<param name="arg2">The second parameter of the method that this delegate encapsulates.</param>
<param name="arg3">The third parameter of the method that this delegate encapsulates.</param>
<param name="arg4">The fourth parameter of the method that this delegate encapsulates.</param>
<param name="arg5">The fifth parameter of the method that this delegate encapsulates.</param>
<param name="arg6">The sixth parameter of the method that this delegate encapsulates.</param>
<param name="arg7">The seventh parameter of the method that this delegate encapsulates.</param>
<param name="arg8">The eighth parameter of the method that this delegate encapsulates.</param>
<param name="arg9">The ninth parameter of the method that this delegate encapsulates.</param>
<param name="arg10">The tenth parameter of the method that this delegate encapsulates.</param>
<typeparam name="T1">The type of the first parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T2">The type of the second parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T3">The type of the third parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T4">The type of the fourth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T5">The type of the fifth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T6">The type of the sixth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T7">The type of the seventh parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T8">The type of the eighth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T9">The type of the ninth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T10">The type of the tenth parameter of the method that this delegate encapsulates.</typeparam>

--------------------
type Action<'T1,'T2,'T3,'T4,'T5,'T6,'T7,'T8,'T9> = new: object: obj * method: nativeint -> unit member BeginInvoke: arg1: 'T1 * arg2: 'T2 * arg3: 'T3 * arg4: 'T4 * arg5: 'T5 * arg6: 'T6 * arg7: 'T7 * arg8: 'T8 * arg9: 'T9 * callback: AsyncCallback * object: obj -> IAsyncResult member EndInvoke: result: IAsyncResult -> unit member Invoke: arg1: 'T1 * arg2: 'T2 * arg3: 'T3 * arg4: 'T4 * arg5: 'T5 * arg6: 'T6 * arg7: 'T7 * arg8: 'T8 * arg9: 'T9 -> unit
<summary>Encapsulates a method that has nine parameters and does not return a value.</summary>
<param name="arg1">The first parameter of the method that this delegate encapsulates.</param>
<param name="arg2">The second parameter of the method that this delegate encapsulates.</param>
<param name="arg3">The third parameter of the method that this delegate encapsulates.</param>
<param name="arg4">The fourth parameter of the method that this delegate encapsulates.</param>
<param name="arg5">The fifth parameter of the method that this delegate encapsulates.</param>
<param name="arg6">The sixth parameter of the method that this delegate encapsulates.</param>
<param name="arg7">The seventh parameter of the method that this delegate encapsulates.</param>
<param name="arg8">The eighth parameter of the method that this delegate encapsulates.</param>
<param name="arg9">The ninth parameter of the method that this delegate encapsulates.</param>
<typeparam name="T1">The type of the first parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T2">The type of the second parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T3">The type of the third parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T4">The type of the fourth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T5">The type of the fifth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T6">The type of the sixth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T7">The type of the seventh parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T8">The type of the eighth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T9">The type of the ninth parameter of the method that this delegate encapsulates.</typeparam>

--------------------
type Action<'T1,'T2,'T3,'T4,'T5,'T6,'T7,'T8> = new: object: obj * method: nativeint -> unit member BeginInvoke: arg1: 'T1 * arg2: 'T2 * arg3: 'T3 * arg4: 'T4 * arg5: 'T5 * arg6: 'T6 * arg7: 'T7 * arg8: 'T8 * callback: AsyncCallback * object: obj -> IAsyncResult member EndInvoke: result: IAsyncResult -> unit member Invoke: arg1: 'T1 * arg2: 'T2 * arg3: 'T3 * arg4: 'T4 * arg5: 'T5 * arg6: 'T6 * arg7: 'T7 * arg8: 'T8 -> unit
<summary>Encapsulates a method that has eight parameters and does not return a value.</summary>
<param name="arg1">The first parameter of the method that this delegate encapsulates.</param>
<param name="arg2">The second parameter of the method that this delegate encapsulates.</param>
<param name="arg3">The third parameter of the method that this delegate encapsulates.</param>
<param name="arg4">The fourth parameter of the method that this delegate encapsulates.</param>
<param name="arg5">The fifth parameter of the method that this delegate encapsulates.</param>
<param name="arg6">The sixth parameter of the method that this delegate encapsulates.</param>
<param name="arg7">The seventh parameter of the method that this delegate encapsulates.</param>
<param name="arg8">The eighth parameter of the method that this delegate encapsulates.</param>
<typeparam name="T1">The type of the first parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T2">The type of the second parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T3">The type of the third parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T4">The type of the fourth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T5">The type of the fifth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T6">The type of the sixth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T7">The type of the seventh parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T8">The type of the eighth parameter of the method that this delegate encapsulates.</typeparam>

--------------------
type Action<'T1,'T2,'T3,'T4,'T5,'T6,'T7> = new: object: obj * method: nativeint -> unit member BeginInvoke: arg1: 'T1 * arg2: 'T2 * arg3: 'T3 * arg4: 'T4 * arg5: 'T5 * arg6: 'T6 * arg7: 'T7 * callback: AsyncCallback * object: obj -> IAsyncResult member EndInvoke: result: IAsyncResult -> unit member Invoke: arg1: 'T1 * arg2: 'T2 * arg3: 'T3 * arg4: 'T4 * arg5: 'T5 * arg6: 'T6 * arg7: 'T7 -> unit
<summary>Encapsulates a method that has seven parameters and does not return a value.</summary>
<param name="arg1">The first parameter of the method that this delegate encapsulates.</param>
<param name="arg2">The second parameter of the method that this delegate encapsulates.</param>
<param name="arg3">The third parameter of the method that this delegate encapsulates.</param>
<param name="arg4">The fourth parameter of the method that this delegate encapsulates.</param>
<param name="arg5">The fifth parameter of the method that this delegate encapsulates.</param>
<param name="arg6">The sixth parameter of the method that this delegate encapsulates.</param>
<param name="arg7">The seventh parameter of the method that this delegate encapsulates.</param>
<typeparam name="T1">The type of the first parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T2">The type of the second parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T3">The type of the third parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T4">The type of the fourth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T5">The type of the fifth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T6">The type of the sixth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T7">The type of the seventh parameter of the method that this delegate encapsulates.</typeparam>

--------------------
type Action<'T1,'T2,'T3,'T4,'T5,'T6> = new: object: obj * method: nativeint -> unit member BeginInvoke: arg1: 'T1 * arg2: 'T2 * arg3: 'T3 * arg4: 'T4 * arg5: 'T5 * arg6: 'T6 * callback: AsyncCallback * object: obj -> IAsyncResult member EndInvoke: result: IAsyncResult -> unit member Invoke: arg1: 'T1 * arg2: 'T2 * arg3: 'T3 * arg4: 'T4 * arg5: 'T5 * arg6: 'T6 -> unit
<summary>Encapsulates a method that has six parameters and does not return a value.</summary>
<param name="arg1">The first parameter of the method that this delegate encapsulates.</param>
<param name="arg2">The second parameter of the method that this delegate encapsulates.</param>
<param name="arg3">The third parameter of the method that this delegate encapsulates.</param>
<param name="arg4">The fourth parameter of the method that this delegate encapsulates.</param>
<param name="arg5">The fifth parameter of the method that this delegate encapsulates.</param>
<param name="arg6">The sixth parameter of the method that this delegate encapsulates.</param>
<typeparam name="T1">The type of the first parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T2">The type of the second parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T3">The type of the third parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T4">The type of the fourth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T5">The type of the fifth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T6">The type of the sixth parameter of the method that this delegate encapsulates.</typeparam>

--------------------
type Action<'T1,'T2,'T3,'T4,'T5> = new: object: obj * method: nativeint -> unit member BeginInvoke: arg1: 'T1 * arg2: 'T2 * arg3: 'T3 * arg4: 'T4 * arg5: 'T5 * callback: AsyncCallback * object: obj -> IAsyncResult member EndInvoke: result: IAsyncResult -> unit member Invoke: arg1: 'T1 * arg2: 'T2 * arg3: 'T3 * arg4: 'T4 * arg5: 'T5 -> unit
<summary>Encapsulates a method that has five parameters and does not return a value.</summary>
<param name="arg1">The first parameter of the method that this delegate encapsulates.</param>
<param name="arg2">The second parameter of the method that this delegate encapsulates.</param>
<param name="arg3">The third parameter of the method that this delegate encapsulates.</param>
<param name="arg4">The fourth parameter of the method that this delegate encapsulates.</param>
<param name="arg5">The fifth parameter of the method that this delegate encapsulates.</param>
<typeparam name="T1">The type of the first parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T2">The type of the second parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T3">The type of the third parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T4">The type of the fourth parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T5">The type of the fifth parameter of the method that this delegate encapsulates.</typeparam>

--------------------
type Action<'T1,'T2,'T3,'T4> = new: object: obj * method: nativeint -> unit member BeginInvoke: arg1: 'T1 * arg2: 'T2 * arg3: 'T3 * arg4: 'T4 * callback: AsyncCallback * object: obj -> IAsyncResult member EndInvoke: result: IAsyncResult -> unit member Invoke: arg1: 'T1 * arg2: 'T2 * arg3: 'T3 * arg4: 'T4 -> unit
<summary>Encapsulates a method that has four parameters and does not return a value.</summary>
<param name="arg1">The first parameter of the method that this delegate encapsulates.</param>
<param name="arg2">The second parameter of the method that this delegate encapsulates.</param>
<param name="arg3">The third parameter of the method that this delegate encapsulates.</param>
<param name="arg4">The fourth parameter of the method that this delegate encapsulates.</param>
<typeparam name="T1">The type of the first parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T2">The type of the second parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T3">The type of the third parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T4">The type of the fourth parameter of the method that this delegate encapsulates.</typeparam>

--------------------
type Action<'T1,'T2,'T3> = new: object: obj * method: nativeint -> unit member BeginInvoke: arg1: 'T1 * arg2: 'T2 * arg3: 'T3 * callback: AsyncCallback * object: obj -> IAsyncResult member EndInvoke: result: IAsyncResult -> unit member Invoke: arg1: 'T1 * arg2: 'T2 * arg3: 'T3 -> unit
<summary>Encapsulates a method that has three parameters and does not return a value.</summary>
<param name="arg1">The first parameter of the method that this delegate encapsulates.</param>
<param name="arg2">The second parameter of the method that this delegate encapsulates.</param>
<param name="arg3">The third parameter of the method that this delegate encapsulates.</param>
<typeparam name="T1">The type of the first parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T2">The type of the second parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T3">The type of the third parameter of the method that this delegate encapsulates.</typeparam>

--------------------
type Action<'T1,'T2> = new: object: obj * method: nativeint -> unit member BeginInvoke: arg1: 'T1 * arg2: 'T2 * callback: AsyncCallback * object: obj -> IAsyncResult member EndInvoke: result: IAsyncResult -> unit member Invoke: arg1: 'T1 * arg2: 'T2 -> unit
<summary>Encapsulates a method that has two parameters and does not return a value.</summary>
<param name="arg1">The first parameter of the method that this delegate encapsulates.</param>
<param name="arg2">The second parameter of the method that this delegate encapsulates.</param>
<typeparam name="T1">The type of the first parameter of the method that this delegate encapsulates.</typeparam>
<typeparam name="T2">The type of the second parameter of the method that this delegate encapsulates.</typeparam>

--------------------
type Action<'T> = new: object: obj * method: nativeint -> unit member BeginInvoke: obj: 'T * callback: AsyncCallback * object: obj -> IAsyncResult member EndInvoke: result: IAsyncResult -> unit member Invoke: obj: 'T -> unit
<summary>Encapsulates a method that has a single parameter and does not return a value.</summary>
<param name="obj">The parameter of the method that this delegate encapsulates.</param>
<typeparam name="T">The type of the parameter of the method that this delegate encapsulates.</typeparam>

--------------------
type Action = new: object: obj * method: nativeint -> unit member BeginInvoke: callback: AsyncCallback * object: obj -> IAsyncResult member EndInvoke: result: IAsyncResult -> unit member Invoke: unit -> unit
<summary>Encapsulates a method that has no parameters and does not return a value.</summary>

val ignore: value: 'T -> unit