Added a `--dump-only` option which disables forwarding of trace spans.
This essentially makes the forwarder a NOP but can be useful for testing
purposes.
Fixes: #2132.
Signed-off-by: James O. D. Hunt <james.o.hunt@intel.com>
Our dependencies already bring several versions of nix, we should avoid
adding even more fragementation.
Fixes#2114
Signed-off-by: Samuel Ortiz <samuel.e.ortiz@protonmail.com>
Implement an openTelemetry custom exporter that sends trace spans to a
VSOCK socket. A VSOCK-to-span converter (such as the Kata trace
forwarder) needs to be running on the host to allow systems like Jaeger
to capture the trace spans.
By default, tracing is not enabled (meaning a NOP tracer is used). To
activate tracing, set the `agent.kata.enable_tracing=true` in the
configuration file.
The type of tracing this change introduces is "static isolated"
tracing. See [1] for further details.
> **Note:**
>
> This change only provides the foundational changes for agent
> tracing work. The feature is _not_ yet complete since it does
> not yet show the correct trace hierarchy.
Fixes: #60.
[1] - https://github.com/kata-containers/agent/blob/master/TRACING.md
Signed-off-by: James O. D. Hunt <james.o.hunt@intel.com>
Return a guard variable from `create_logger()` which the caller can
implicitly drop to guarantee that all threads started by the async log
drain are stopped.
This fixes a long-standing bug [1] whereby the agent could panic with
the following error, generated by the `slog` logging crate:
```
slog::Fuse Drain: Custom { kind: Other, error: "serde serialization error: Bad file descriptor (os error 9)" }
```
[1] - See https://github.com/kata-containers/kata-containers/issues/171.
Signed-off-by: James O. D. Hunt <james.o.hunt@intel.com>
Otherwise `make install` run from the top directory would just fail as
the target is not defined.
Fixes: #1149
Signed-off-by: Fabiano Fidêncio <fidencio@redhat.com>
Anyone can collaborate in the Kata Containers project, so instead of
adding her/his name and email to the Cargo.toml files, use
`The Kata Containers community` as name and
`kata-dev@lists.katacontainers.io` as email.
fixes#643
Signed-off-by: Julio Montes <julio.montes@intel.com>
Add a new system component, used only when tracing is enabled. The
component listens to the agent over VSOCK, forwarding trace spans
created by the agent in the virtual machine onwards to an OpenTelemetry
collector (such as Jaeger) running on the host.
Fixes: #224.
Signed-off-by: James O. D. Hunt <james.o.hunt@intel.com>
