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Add guidance for capturing ETW traces in Kubernetes pods#2344

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Dec 3, 2025
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Add guidance for capturing ETW traces in Kubernetes pods#2344
brianrob merged 4 commits into
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copilot/add-guidance-for-traces-in-k8s

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Copilot AI commented Dec 1, 2025

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  • Explore the repository structure and existing documentation
  • Understand the existing Windows containers section in UsersGuide.htm
  • Research EnableEventsInContainers and ImageIDsOnly options
  • Add new section "Capturing ETW Traces with Process-Isolation Windows Containers (Kubernetes)" to UsersGuide.htm
  • Address PR review feedback:
    • Clarify process-isolation is the default mode
    • Add note that Hyper-V mode doesn't require these instructions
    • Fix kernel session limitation explanation
    • Remove "(Required)" from Step 1 heading
    • Add that host user-mode events still work without /EnableEventsInContainers
    • Add note about building PerfViewCollect from source
    • Fix PDB signature terminology
    • Update error example to show "module!?" format
    • Clarify jitted code still works
    • Explain merge component container access limitation
  • Run code review
Original prompt

This section details on the original issue you should resolve

<issue_title>Guidance on How to Capture Traces in Kubernetes Pods</issue_title>
<issue_description>> Hi @brianrob. I'm currently running into a similar issue trying to run PerfView in a k8s pod. For those less knowledgeable with this tool is it possible to provide more context of what to do in this scenario?

Is the expectation on the Host node a user manually starts the PerfView process to collect a trace using the /EnbleEventsInContainer parameter. After they are done collecting the trace you then copy the zip into the container and perform a PerfView merge -ImageIDsOnly NameOfTrace.etl.zip? What does -ImageIDsOnly do exactly? I run that command and can't really tell if it worked.

If you don't run -ImageIDsOnly is it still possible to use that trace to profile what occurred in the k8s pod?

If this should be a new issue or discussion please let me know. Thanks!

Originally posted by @Cjewett in #1790</issue_description>

<agent_instructions>Please add a section to the PerfView users guide on how to capture ETW traces when one or more processes are in process-isolation Windows containers. It would be especially helpful if you provide example command lines, and describe what each command does, as well as which ones are required and which ones are optional. If they're optional, describe what happens if you don't run them.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

@brianrob There are some strong limitations in how we can best collect ETW traces on Windows when containers are involved. The happy path is the following:
  1. Capture an ETW trace on the host node. Specify /EnableEventsInContainers when collecting to ensure that user-mode events flow from processes inside of containers back to the ETW session. If you don't specify this, then you'll get all kernel events but only user-mode events from processes running directly on the host and not inside of a container.
  2. At this point, as long as the container(s) containing the process(es) of interest are still running, you can open and analyze the trace on the host node. PerfView will be able to find any binaries that it needs both on the host and inside the containers.
  3. If you want to shutdown a container of interest, or copy the trace to another machine for analysis where the container is inaccessible, then you'll need to copy the trace into the container, and then inside the container, run PerfViewCollect merge -ImageIDsOnly <path/to/trace>. Once it completes, copy the resulting file (overwrites the original) out of the container. This command is responsible for opening all of the accessible binaries that have symbols in the trace, and injects PDB information into the trace, so that we can download the PDBs from the symbol server later on during analysis. If you don't do this, then some symbols just won't be resolvable later. The data is still valid, but might be less useful.</comment_new>
    <comment_new>@brianrob
    @Cjewett, let me know if you have any questions on this. I'm also going to use this issue to get copilot to update the PerfView users guide with this information.</comment_new>

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

Co-authored-by: brianrob <6210322+brianrob@users.noreply.github.com>
Copilot AI changed the title [WIP] Provide guidance on capturing traces in Kubernetes pods Add guidance for capturing ETW traces in Kubernetes pods Dec 1, 2025
Copilot AI requested a review from brianrob December 1, 2025 20:38

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@copilot, please address these comments.

<!-- *************** -->
<h5><a id="ProcessIsolationContainers">Capturing ETW Traces with Process-Isolation Windows Containers (Kubernetes)</a></h5>
<p>
When running Windows containers in Kubernetes using process-isolation mode (as opposed to Hyper-V isolation),

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Clarify that process-isolation mode is the default and that if running in Hyper-V mode, these instructions are not required - just capture inside the container.

workflow to capture and analyze traces for processes running inside these containers.
</p>
<p>
<strong>Important Limitation:</strong> Because ETW is a kernel-level feature and process-isolation containers

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Kernel sessions specifically cannot be started from inside of a container. PerfView almost always captures a kernel session, so we should assume so here.

must be initiated from the host node.
</p>

<h6>Step 1: Capture a Trace on the Host Node (Required)</h6>

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Suggested change
<h6>Step 1: Capture a Trace on the Host Node (Required)</h6>
<h6>Step 1: Capture a Trace on the Host Node</h6>

<strong>What happens if you don't use /EnableEventsInContainers:</strong> You will still capture all kernel
events (CPU sampling, context switches, etc.) for container processes, but you will miss user-mode events
like .NET garbage collection events, JIT events, exception events, and any custom EventSource events from
those processes.

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You will still get user-mode events from processes running directly on the host node (outside of containers).

Then, inside the container, run the merge command to inject the necessary image identification data:
</p>
<ul>
<li>PerfViewCollect merge /ImageIDsOnly MyContainerTrace.etl.zip</li>

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Note: PerfViewCollect needs to be built from source at https://github.com/microsoft/perfview. It is not currently shipped as a binary.

<p>
<strong>What /ImageIDsOnly does:</strong> When you run merge with /ImageIDsOnly, PerfView reads through
the trace and for each DLL that was loaded by processes in the trace, it looks up the DLL's unique
identifier (signature/timestamp) and injects that information into the trace. This unique identifier

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It actually looks up the PDB signature.

<strong>What happens if you don't run merge with /ImageIDsOnly:</strong> If you skip this step and later
try to analyze the trace on another machine after the container is gone, PerfView will be unable to find
the symbol files for DLLs that were loaded inside the container. Your stack traces will show addresses
like "0x7ffe12345678" instead of method names for those DLLs. The managed code (.NET) symbols may still

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The stacks will just show the module name with a question mark. For example: MyAssembly!? instead of MyAssembly!MyClass.MyMethod.

try to analyze the trace on another machine after the container is gone, PerfView will be unable to find
the symbol files for DLLs that were loaded inside the container. Your stack traces will show addresses
like "0x7ffe12345678" instead of method names for those DLLs. The managed code (.NET) symbols may still
work since they come from NGEN PDBs or crossgen2 metadata, but native code (including the runtime itself)

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Jitted code will still work, but nothing else will that comes from a binary inside of the container.

will have missing symbols.
</p>
<p>
<strong>Why run merge inside the container:</strong> The merge command needs access to the actual DLL

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The merger is a shared component and doesn't have access to look inside of containers, thus you must run it inside of the container(s).

Co-authored-by: brianrob <6210322+brianrob@users.noreply.github.com>

Copilot AI commented Dec 1, 2025

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@copilot, please address these comments.

Addressed all review comments in commit 15fe2b2.

Copilot AI requested a review from brianrob December 1, 2025 20:53
@brianrob
brianrob marked this pull request as ready for review December 3, 2025 00:56
@brianrob

brianrob commented Dec 3, 2025

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Copilot Post-Mortem:

  • As expected, it was easy to have copilot take my bullet points and write a more complete document.

mitchellvette pushed a commit to mitchellvette/zenvizor that referenced this pull request Jul 1, 2026
Updated
[Microsoft.Diagnostics.Tracing.TraceEvent](https://github.com/Microsoft/perfview)
from 3.1.16 to 3.2.4.

<details>
<summary>Release notes</summary>

_Sourced from [Microsoft.Diagnostics.Tracing.TraceEvent's
releases](https://github.com/Microsoft/perfview/releases)._

## 3.2.4

## Security
This release contains security hardening fixes for a number of
malformed-input parsing and path-traversal vulnerabilities:
- Bounds-checking for malformed event payloads in the BPerf ULZ777
decompressor and event-record parser
- Bounds-checking for malformed metadata in the GCDynamic,
RegisteredTraceEventParser (TDH), Dynamic, and EventPipe V3 parsers
- Bounds-checking for malformed PE CodeView and Resource directory
entries
- Path containment hardening for PDB extraction (zipped ETL + container
PDBs), DiagSession resource extraction, R2R perf map writes, PdbScope
module paths, and dynamic manifest writes
- Path-traversal and command-execution hardening for Source Server
lookups

## What's Changed
* Update CsWin32 Package Version by @​brianrob in
microsoft/perfview#2425
* Fix incorrect field offsets when parsing ETW events with fixed-count
array fields by @​Copilot in
microsoft/perfview#2427
* Retarget Native Profiler Builds To VS 2026 V145 Toolset by @​brianrob
in microsoft/perfview#2428
* Stabilize XamlMessageBox UI-thread dispatch test by @​brianrob in
microsoft/perfview#2430

**Full Changelog**:
microsoft/perfview@v3.2.3...v3.2.4


## 3.2.3

## What's Changed
* Upgrade Microsoft.Windows.CsWin32 to 0.3.209 (GHSA-ghhp-997w-qr28) by
@​Copilot in microsoft/perfview#2409
* Enable Spectre mitigations and linker optimizations for EtwClrProfiler
by @​danmoseley in microsoft/perfview#2410
* Fix 'unhanded' / 'occured' typos in UnhandledExceptionDialog body text
by @​SAY-5 in microsoft/perfview#2413
* Fix GCStats failures on dotnet trace gc-verbose collections (#​2414)
by @​cincuranet in microsoft/perfview#2415
* C entrypoint fixes by @​zachcmadsen in
microsoft/perfview#2421

## New Contributors
* @​SAY-5 made their first contribution in
microsoft/perfview#2413

**Full Changelog**:
microsoft/perfview@v3.2.2...v3.2.3

## 3.2.2

## What's Changed
* Fix PDB Symbol Resolution for Unmerged Windows Traces by @​brianrob in
microsoft/perfview#2407


**Full Changelog**:
microsoft/perfview@v3.2.1...v3.2.2

## 3.2.1

## Native and R2R Symbol Download and Parsing Now Available
As of this release, if you capture a trace using [`dotnet-trace
collect-linux`](https://learn.microsoft.com/en-us/dotnet/core/diagnostics/dotnet-trace#dotnet-trace-collect-linux)
or
[`record-trace`](https://github.com/microsoft/one-collect/tree/main/record-trace),
**native and R2R symbols can now be downloaded and resolved at analysis
time**. All .NET symbols (both native and R2R) are available on the
Microsoft Symbol Server. Additionally, many Azure Linux symbol files are
available on the Microsoft Symbol Server. For those targeting other
distros, PerfView and TraceEvent are capable of pulling those symbol
files from local directories by adding a local symbol path pointing to
the files.

Most of the work for this was completed in PerfView and TraceEvent 3.2.1
with the final required fixes present in this release.

## What's Changed
* Optimize nettrace-to-TraceLog Conversion by @​brianrob in
microsoft/perfview#2403
* Embed missing System.Text.Json transitive dependencies in PerfView by
@​brianrob in microsoft/perfview#2404


**Full Changelog**:
microsoft/perfview@v3.2.0...v3.2.1

## 3.2.0

## What's Changed
* Fix Debug.Assert failures in SpeedScope tests and
DynamicTraceEventParser by @​brianrob in
microsoft/perfview#2368
* Add TraceParserGen.Tests project and fix code generation bugs by
@​Copilot in microsoft/perfview#2308
* Update UsersGuide.htm by @​AftabAnsari10662 in
microsoft/perfview#2370
* Strip .il and .ni suffixes from TraceModuleFile.Name by @​leculver in
microsoft/perfview#2364
* Handle provider names that start with a numeric digit. by @​brianrob
in microsoft/perfview#2369
* Dispose WebView2 controls before Environment.Exit to prevent finalizer
crash by @​brianrob in microsoft/perfview#2371
* Refactor GetManifestForRegisteredProvider to use XmlWriter by
@​Copilot in microsoft/perfview#2353
* docs: Add investigation guidance for JIT-inlined missing stack frames
by @​Copilot in microsoft/perfview#2377
* Fix spurious BROKEN frame at top of Linux thread stacks in CPU Stacks
viewer by @​Copilot in microsoft/perfview#2375
* Fix NRE in AddUniversalDynamicSymbol for invalid symbol address ranges
by @​brianrob in microsoft/perfview#2376
* Add missing authority parameter to log by @​hoyosjs in
microsoft/perfview#2379
* Replace individual code owners with microsoft/perfview-reviewers group
by @​brianrob in microsoft/perfview#2381
* Fix Dynamic Symbol Resolution for Mappings Shared Across Multiple
Processes in Universal Traces by @​brianrob in
microsoft/perfview#2380
* Implement Symbol Demanglers for Linux Binaries by @​brianrob in
microsoft/perfview#2383
* Fix NullReferenceException race condition in
TraceLog.AllocLookup/FreeLookup by @​Copilot in
microsoft/perfview#2387
* Add typed schema for AllocationSampled (EventID 303, .NET 10+) in
ClrTraceEventParser by @​Copilot in
microsoft/perfview#2388
* Add ElfSymbolModule for Parsing ELF Symbol Tables by @​brianrob in
microsoft/perfview#2384
* Update BDN to latest version. by @​cincuranet in
microsoft/perfview#2389
* Fixed overflow when working with large dumps by @​remilema in
microsoft/perfview#2399
* Fix XamlMessageBox STA Threading Crash from Background Threads by
@​brianrob in microsoft/perfview#2400
* Add ELF Symbol Resolution for Linux .nettrace Traces by @​brianrob in
microsoft/perfview#2397
* Add Missing WCF Event Templates by @​brianrob in
microsoft/perfview#2390

## New Contributors
* @​AftabAnsari10662 made their first contribution in
microsoft/perfview#2370
* @​remilema made their first contribution in
microsoft/perfview#2399

**Full Changelog**:
microsoft/perfview@v3.1.30...v3.2.0

## 3.1.30

## What's Changed
* doc: fix typos by @​chinwobble in
microsoft/perfview#2359
* Fix SourceLink parsing to support both wildcard and exact path
mappings by @​ivberg in microsoft/perfview#2355
* add horizontal scrolling to eventviewer by @​logangeorge01 in
microsoft/perfview#2361
* Add SHA-384 and SHA-512 hash algorithm support for PDB checksums by
@​Copilot in microsoft/perfview#2366

## New Contributors
* @​chinwobble made their first contribution in
microsoft/perfview#2359
* @​logangeorge01 made their first contribution in
microsoft/perfview#2361

**Full Changelog**:
microsoft/perfview@v3.1.29...v3.1.30

## 3.1.29

## What's Changed
* Warn users when circular buffer overflow causes missing type info in
allocation views for selected processes by @​Copilot in
microsoft/perfview#2326
* Special-Case BitMask Parsing by @​brianrob in
microsoft/perfview#2327
* Refactor PEFile and PEHeader to use ReadOnlySpan exclusively with
zero-copy buffer sharing by @​Copilot in
microsoft/perfview#2317
* Fix cdbstack parser dropping last sample and missing metrics by
@​Copilot in microsoft/perfview#2329
* Fix unhandled ArgumentOutOfRangeException when exporting FlameGraph
with unrendered canvas by @​Copilot in
microsoft/perfview#2339
* Add guidance for capturing ETW traces in Kubernetes pods by @​Copilot
in microsoft/perfview#2344
* Fix merge command line order in kubernetes documentation by @​Copilot
in microsoft/perfview#2346
* Fix GetRegisteredOrEnabledProviders() documentation claiming list is
small by @​Copilot in microsoft/perfview#2348
* Fix duplicate stringTable elements in instrumentation manifest by
@​Copilot in microsoft/perfview#2347
* Fix Histogram.AddMetric losing values after single-bucket to array
transition by @​Copilot in
microsoft/perfview#2337
* Fix clipboard copy formatting based on selection dimensions in Stack
Viewer by @​Copilot in microsoft/perfview#2332
* Fix XML escaping in GetManifestForRegisteredProvider by @​Copilot in
microsoft/perfview#2351
* Fix race condition in ProviderNameToGuid causing
ERROR_INSUFFICIENT_BUFFER crashes by @​Copilot in
microsoft/perfview#2357


**Full Changelog**:
microsoft/perfview@v3.1.28...v3.1.29

## 3.1.28

## What's Changed
* Add support for Boolean8 to NetTrace V6. by @​noahfalk in
microsoft/perfview#2318
* Implement A Thread Time View for Universal Traces by @​brianrob in
microsoft/perfview#2320
* Remove Incorrect Argument Description by @​brianrob in
microsoft/perfview#2323

**Full Changelog**:
microsoft/perfview@v3.1.26...v3.1.28

## 3.1.26

Roll-up through 2025/10/10.

* Only dispose non-null handles in `ETWTraceEventSource`
[#​2291](microsoft/perfview#2291)
* Small cleanup in `NettraceUniversalConverter`
[#​2292](microsoft/perfview#2292)
* Fix hyperlink focus visibility in dark mode and improve keyboard
navigation [#​2295](microsoft/perfview#2295)
* Gracefully handle invalid characters in `PATH`
[#​2296](microsoft/perfview#2296)
* Fix copying First/Last columns with pipe symbols to work in time range
input [#​2304](microsoft/perfview#2304)


## 3.1.24

Roll-up through 2025/08/26.

* Implement NuGet Central Package Version Management [#​2262]
* Fix broken stacks warning for universal traces [#​2268]
* Fix jitted code symbols in universal traces to show assembly names
instead of memfd:doublemapper [#​2269]
* Use themed background brush for menu and filter [#​2272]
* Improve rendering and dark mode [#​2274]
* Implement configurable symbol server authentication with /SymbolsAuth
command line argument for PerfView and HeapDump [#​2278]
* Add a themed dialog [#​2276]
* Fix regression: "Goto Item in Callers/Callees" now accumulates across
all threads [#​2284]
* Fix parsing issues and add support for additional events to the Linux
perf text file parser [#​2286]
* Fix TraceLog live session RelatedActivityID/ContainerID corruption by
preserving ExtendedData [#​2285]
* NetTrace LabelList metadata overrides and metadata flushing [#​2281]
* Fix NullReferenceException in ProviderBrowser.LevelSelected when
deselecting level [#​2289]

## 3.1.23

Roll-up through 2025/07/11.

- Fixed TraceEvent CaptureState API to support previously unsupported
keyword configurations. [#​2222]
- Added Exception Stacks view for .nettrace files to enhance exception
diagnostics. [#​2223]
- Corrected outdated documentation references to "GC Heap Alloc Stacks".
[#​2224]
- Fixed off-by-one error in P/Invoke buffer handling for Windows volume
events. [#​2227]
- Fixed broken links in the PerfView user guide. [#​2225]
- Improved error handling by throwing when TdhEnumerateProviders fails,
enabling better diagnostics. [#​2177]
- Added AutomationProperties.Name to the Process Selection DataGrid for
improved accessibility. [#​2239]
- Fixed focus indicator visibility for hyperlinks in dark mode and high
contrast themes. [#​2235]
- Addressed NullReferenceException in Anti-Malware view. [#​2233]
- Fixed WebView2 crash on close by implementing proper disposal pattern.
[#​2230]
- Added support for native AOT gcdumps, expanding compatibility with
modern .NET workloads. [#​2242]
- Fixed NVDA screen reader issue where Theme menu items did not announce
selection state. [#​2237]
- Extended PredefinedDynamicTraceEventParser to support dynamic events
from additional sources. [#​2232]
- Implemented MSFZ symbol format support in SymbolReader. [#​2244]
- Removed usage of DefaultAzureCredential, simplifying authentication
dependencies. [#​2255]
- Added option to hide TimeStamp columns in the EventWindow View menu.
[#​2247]
- Fixed NVDA screen reader reporting incorrect list count for File menu
separators. [#​2257]
- Fixed unhandled exception when double-clicking in scroll bar area with
no content. [#​2254]
- Fixed universal symbol conversion for overlapping mappings. [#​2252]
- Fixed TraceEvent.props to respect ProcessorArchitecture when
RuntimeIdentifier is set. [#​2249]

## 3.1.22

Roll-up through 2025/06/04.

- Added GC Heap Analyzer support for .nettrace files to enhance memory
analysis workflows. [#​2216]
- Introduced PredefinedDynamicTraceEventParser for known
TraceLogging events, improving trace event parsing. [#​2220]
- Enabled selection of process trees in the process selection dialog for
multi-process analysis, allowing deeper inspection across related
processes. [#​2195]
- Implemented sorting for the Duration column in the process selection
dialog using TotalDurationSeconds, improving usability. [#​2194]
- Improved NetTrace parameter parsing for better command-line
flexibility. [#​2200]
- Fixed GetActiveSessionNames to handle ERROR_MORE_DATA, resolving
session enumeration issues. [#​2196]
- Fixed ObjectDisposedException when opening Net OS Heap Alloc Stacks,
improving stability. [#​2212]
- Fixed null reference exception in GenFragmentationPercent method,
enhancing reliability. [#​2211]
 - Fixed TreeView auto-expansion when opening trace files. [#​2218]
- Fixed StackViewer issue where "Set Time Range" reset "Goto Items by
callees". [#​2208]
- Fixed markdown table formatting when copying from the stack viewer.
[#​2203]
- Fixed TraceEvent NuGet package to exclude Windows-specific native
DLLs. [#​2215]
- Removed PDB generation for .NET Core assemblies using CrossGen,
reducing build overhead. [#​2202]
- Made symbol server timeout configurable and removed dead code in
SymbolReader. [#​2209]
- Changed help ribbons to use textblocks, enabling tab navigation.
[#​2201]

## 3.1.21

Roll-up through 2025/05/02.

- Change NetTrace format version support
- Add /OSHeapMaxMB to set a max size for OS heap sessions
- Implement Nettrace Support for Traces with Universal Providers
- Implement R2R Symbol Lookup for Linux Traces
- Fix NetTrace parsing for Start/Stop event names
- Fix IndexOutOfRangeException in ProcessGlobalHistory

## 3.1.20

Roll-up through 2025/04/01.

 - Flamegraph and drill-in menu improvements
 - Performance improvements around unhandled event dispatch
 - Add configurable real-time delay in TraceLogEventSource
- Don't queue another flush during a real-time ETW session if one is
already in-process
- Allow configuration of rundown providers for real-time EventPipe
sessions
 - Fix stack handling for NetTrace V4
 - Add multi-line view for events viewer
 - Misc accessibility fixes

## 3.1.19

Roll-up through 2025/01/30.

 - Added missing time information in the Raw XML View for GCStats.
 - Updated activity computation logic to support OpenTelemetry events.
 - Changed timestamp values to use QPC time based on UTC for Relogger.
 - Fixed issues with report command handling.
 - Addressed various POH-related issues.
- Implemented file-size limitation for rundown using an ETW-based
approach.

## 3.1.18

Roll-up through 2024/12/11.

 - Fixed `perfcollect` install script on Azure Linux 3.
- Updated `System.Text.Json` to address
dotnet/announcements#329.

## 3.1.17

Roll-up through 2024/11/08.

- Numerous accessibility fixes to PerfView. This includes switching out
the previous web browser plugin to use WebView2.
- Breaking changes to FastSerialization to ensure that only expected
types are deserialized. This addresses potential vulnerabilities during
deserialization of untrusted input. Details at
microsoft/perfview#2121.

Commits viewable in [compare
view](microsoft/perfview@v3.1.16...v3.2.4).
</details>

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
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Guidance on How to Capture Traces in Kubernetes Pods

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