OpenTelemetry tracing of Dbus calls

[Thomas Kluyver]

On Mon, 9 Jan 2023, at 10:28, Umut Tezduyar Lindskog wrote:
> Can the tracing/context data be sent over the dbus message header, granted this needs to be supported by the dbus client libraries? 

D-Bus has a 'header fields' array, but it doesn't allow non-standard headers, so to add a new field you'd need to propose a change to the spec. There are only 9 fields defined so far, in contrast to the dozens of standardised header fields for HTTP, and those 9 are all kind of integral to using D-Bus - there's no general metadata like the HTTP Date or Server headers. So I might guess this would be a tough sell, though it's not up to me.

Have you come across specific scenarios where something you're tracing is using D-Bus messages and you want to follow them? Perhaps starting from a concrete example would make prompt more discussion than the abstract approach.

Best wishes,
Thomas
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