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Trace - Get

Captures a diagnostic trace of a process based on a predefined set of trace profiles.

HTTP Route

GET /trace?pid={pid}&uid={uid}&name={name}&profile={profile}&durationSeconds={durationSeconds}&egressProvider={egressProvider}&tags={tags} HTTP/1.1

Note

Process information (IDs, names, environment, etc) may change between invocations of these APIs. Processes may start or stop between API invocations, causing this information to change.

Host Address

The default host address for these routes is https://localhost:52323. This route is only available on the addresses configured via the --urls command line parameter and the DOTNETMONITOR_URLS environment variable.

URI Parameters

Name In Required Type Description
pid query false int The ID of the process.
uid query false guid A value that uniquely identifies a runtime instance within a process.
name query false string The name of the process.
profile query false TraceProfile The name of the profile(s) used to collect events. See TraceProfile for details on the list of event providers, levels, and keywords each profile represents. Multiple profiles may be specified by separating them with commas. Default is Cpu,Http,Metrics
durationSeconds query false int The duration of the trace operation in seconds. Default is 30. Min is -1 (indefinite duration). Max is 2147483647.
egressProvider query false string If specified, uses the named egress provider for egressing the collected trace. When not specified, the trace is written to the HTTP response stream. See Egress Providers for more details.
tags query false string (7.1+) A comma-separated list of user-readable identifiers for the operation.

See ProcessIdentifier for more details about the pid, uid, and name parameters.

If none of pid, uid, or name are specified, a trace of the default process will be captured. Attempting to capture a trace of the default process when the default process cannot be resolved will fail.

Authentication

Authentication is enforced for this route. See Authentication for further information.

Allowed schemes:

  • Bearer
  • Negotiate (Windows only, running as unelevated)

Responses

Name Type Description Content Type
200 OK stream A trace of the process when no egress provider is specified. application/octet-stream
202 Accepted When an egress provider is specified, the artifact has begun being collected.
400 Bad Request ValidationProblemDetails An error occurred due to invalid input. The response body describes the specific problem(s). application/problem+json
401 Unauthorized Authentication is required to complete the request. See Authentication for further information.
429 Too Many Requests There are too many trace requests at this time. Try to request a trace at a later time. application/problem+json

Note

(7.1+): Regardless if an egress provider is specified if the request was successful (response codes 200 or 202), the Location header contains the URI of the operation. This can be used to query the status of the operation or change its state.

Note

After the expiration of the trace duration, completing the request may take a long time (up to several minutes) for large applications. The runtime needs to send over the type cache for all managed code that was captured in the trace, known as rundown events. Thus, the length of time of the request may take significantly longer than the requested duration.

Examples

Sample Request

GET /trace?pid=21632&profile=http,metrics&durationSeconds=60 HTTP/1.1
Host: localhost:52323
Authorization: Bearer fffffffffffffffffffffffffffffffffffffffffff=

or

GET /trace?uid=cd4da319-fa9e-4987-ac4e-e57b2aac248b&profile=http,metrics&durationSeconds=60 HTTP/1.1
Host: localhost:52323
Authorization: Bearer fffffffffffffffffffffffffffffffffffffffffff=

Sample Response

The 1 minute trace with http request handling and metric information, chunk encoded, is returned as the response body.

HTTP/1.1 200 OK
Content-Type: application/octet-stream
Transfer-Encoding: chunked
Location: localhost:52323/operations/67f07e40-5cca-4709-9062-26302c484f18

Supported Runtimes

Operating System Runtime Version
Windows .NET Core 3.1, .NET 5+
Linux .NET Core 3.1, .NET 5+
MacOS .NET Core 3.1, .NET 5+

Additional Notes

When to use pid vs uid

See Process ID pid vs Unique ID uid for clarification on when it is best to use either parameter.

View the collected .nettrace file

On Windows, .nettrace files can be viewed in PerfView for analysis or in Visual Studio.

A .nettrace files can be converted to another format (e.g. SpeedScope or Chromium) using the dotnet-trace tool.

Indefinite traces are inaccessible

When setting durationSeconds to -1 (indefinite duration), there is currently no way to terminate the trace operation that preserves the .nettrace file in an accessible format. This also applies when prematurely terminating a trace operation that uses a finite value for durationSeconds.