Remove the `StartTracing` and `StopTracing` agent APIs that toggle
dynamic tracing. This is not supported in Kata 2.x, as documented in the
[tracing proposals document](https://github.com/kata-containers/kata-containers/pull/2062).
Fixes: #2985.
Signed-off-by: James O. D. Hunt <james.o.hunt@intel.com>
Firecracker expose metrics through fifo file
and using a JSON format. This PR will parse the
Firecracker's metrics and convert to Prometheus metrics.
Fixes: #472
Signed-off-by: bin liu <bin@hyper.sh>