feat(tvix/tracing): add tracing-tracy support r/8275

This introduces another feature flag, "tracy" to the `tvix-tracing` crate.

If enabled (not enabled by default), it'll add an additional layer
emitting packets in a format that https://github.com/wolfpld/tracy can
display.

I had to be a bit tricky with the combinatorial complexity when adding
this, but the resulting code still seems manageable.

Change-Id: Ica824496728fa276ceae3f7a9754be0166e6558f
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10952
Tested-by: BuildkiteCI
Reviewed-by: Simon Hauser <simon.hauser@helsinki-systems.de>
Reviewed-by: flokli <flokli@flokli.de>

1 files changed, 1 insertions, 1 deletions

diff --git a/tvix/tracing/default.nix b/tvix/tracing/default.nix
index a4fe3a5d90c3..dd7dc200f2c6 100644
--- a/tvix/tracing/default.nix
+++ b/tvix/tracing/default.nix
@@ -6,6 +6,6 @@
   meta.ci.targets = lib.filter (x: lib.hasPrefix "with-features" x || x == "no-features") (lib.attrNames passthru);
   passthru = depot.tvix.utils.mkFeaturePowerset {
     inherit (old) crateName;
-    features = [ "otlp" ];
+    features = [ "otlp" "tracy" ];
   };
 })