OpenTelemetry tracing of Dbus calls

[Umut Tezduyar Lindskog]

Hi, it would be very nice to hear what you think. If tracing dbus with
OpenTelemetry is something valuable, we could do the implementation in the
spring and contribute back. We just have to agree on the details.

In a nutshell we need to find a way of sending tracing (or even context)
data from the client to a dbus server. As an example, one way of sending
tracing data in http world is through W3C trace HTTP headers that client
appends and the server extracts.

Ex:
traceparent: 00-0af7651916cd43dd8448eb211c80319c-b7ad6b7169203331-01
tracestate: congo=t61rcWkgMzE

Can the tracing/context data be sent over the dbus message header, granted
this needs to be supported by the dbus client libraries?

Umut

On Wed, Nov 30, 2022 at 8:53 AM Umut Tezduyar Lindskog <umut at tezduyar.com>
wrote:

> Hi,
>
>
> We are looking into a standardized way of distributed tracing and
> OpenTelemetry standard has been a winner so far. To be able to do a
> distributed tracing a context needs to be passed from node to node,
> application to application, process to process. This is called “Context
> Propagation” in their terms. There are standard & built-in ways of
> propagating calls in HTTP, grpc etc without changing the APIs.
>
>
> We have network services that have a web API layer and a Dbus based
> service layer. API talks to service and service might be talking to other
> services. We can trace all the way from the cloud to the web API layer with
> minor code additions. I believe OpenTelemetry tracing at the DBus layer
> would be very valuable for the overall picture for similar use cases.
>
>
> Has there been any discussions about OpenTelemetry, integration of context
> propagation to Dbus. If not, what are the suggestions regarding tracing
> Dbus APIs. Is there a way to hook in lttng or ePBF to dbus protocol (or to
> the daemon) and convert their signals to OpenTelemetry traces?
>
>
> Thanks in advance for the feedback
>
> Umut
>
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