EventCounters event is written to an EventListener that never subscribed to it #31500
Description
We have an EventListener listener where the subscription is guarded by a trait that System.Runtime event source doesn't have (TraitName = "AzureEventSource")
protected sealed override void OnEventSourceCreated(EventSource eventSource)
{
base.OnEventSourceCreated(eventSource);
if (eventSource.GetTrait(TraitName) == TraitValue)
{
EnableEvents(eventSource, _level);
}
}
Somehow without subscribing to System.Runtime event source we get EventCounters events with the following stack:
> Azure.Core.dll!Azure.Core.Diagnostics.AzureEventSourceListener.OnEventWritten(System.Diagnostics.Tracing.EventWrittenEventArgs eventData) Line 70 C#
System.Private.CoreLib.dll!System.Diagnostics.Tracing.EventSource.DispatchToAllListeners(int eventId, System.Guid* childActivityID, System.Diagnostics.Tracing.EventWrittenEventArgs eventCallbackArgs) Line 2166 C#
System.Private.CoreLib.dll!System.Diagnostics.Tracing.EventSource.WriteToAllListeners(string eventName, ref System.Diagnostics.Tracing.EventDescriptor eventDescriptor, System.Diagnostics.Tracing.EventTags tags, System.Guid* pActivityId, System.Guid* pChildActivityId, System.Diagnostics.Tracing.EventPayload payload) Line 747 C#
System.Private.CoreLib.dll!System.Diagnostics.Tracing.EventSource.WriteImpl(string eventName, ref System.Diagnostics.Tracing.EventSourceOptions options, object data, System.Guid* pActivityId, System.Guid* pRelatedActivityId, System.Diagnostics.Tracing.TraceLoggingEventTypes eventTypes) Line 695 C#
System.Private.CoreLib.dll!System.Diagnostics.Tracing.PollingCounter.WritePayload(float intervalSec, int pollingIntervalMillisec) Line 76 C#
System.Private.CoreLib.dll!System.Diagnostics.Tracing.CounterGroup.OnTimer() Line 224 C#
System.Private.CoreLib.dll!System.Diagnostics.Tracing.CounterGroup.PollForValues() Line 251 C#
System.Private.CoreLib.dll!System.Threading.ThreadHelper.ThreadStart() Line 100 C#
EventData:
| Name | Value | Type
-- | -- | -- | --
◢ | eventData | {System.Diagnostics.Tracing.EventWrittenEventArgs} | System.Diagnostics.Tracing.EventWrittenEventArgs
| ▶ ActivityId | {00000000-0000-0000-0000-000000000000} | System.Guid
| Channel | None | System.Diagnostics.Tracing.EventChannel
| EventId | -1 | int
| EventName | "EventCounters" | string
| ▶ EventSource | {EventSource(System.Runtime, 49592c0f-5a05-516d-aa4b-a64e02026c89)} | System.Diagnostics.Tracing.EventSource {System.Diagnostics.Tracing.RuntimeEventSource}
| Keywords | None | System.Diagnostics.Tracing.EventKeywords
| Level | LogAlways | System.Diagnostics.Tracing.EventLevel
| Message | null | string
| OSThreadId | 36244 | long
| Opcode | Info | System.Diagnostics.Tracing.EventOpcode
| ▶ Payload | Count = 1 | System.Collections.ObjectModel.ReadOnlyCollection<object>
| ▶ PayloadNames | Count = 1 | System.Collections.ObjectModel.ReadOnlyCollection<string>
| ▶ RelatedActivityId | {00000000-0000-0000-0000-000000000000} | System.Guid
| Tags | None | System.Diagnostics.Tracing.EventTags
| Task | None | System.Diagnostics.Tracing.EventTask
| ▶ TimeStamp | {11/14/2019 7:38:14 PM} | System.DateTime
| Version | 0 | byte
Runtime version: 3.0.0
cc @noahfalk