linera_base::tracing: move into linera-service and linera-web respectively (#4898)

## Motivation

Currently we have one `tracing` entrypoint in `linera-base` to be split
between our various tracing implementations. This entrypoint has a
different implementation for each of our three supported platforms
(`unix`, `web`, and Linera), which makes the conditional compilation
quite complicated.

## Proposal

Instead, move the two present implementations onto target-specific
codepaths (native to `linera-service`, which currently functions as a
catch-all crate for all our Linera UNIX binaries, and Web to
`linera-web`).

`linera-summary` now doesn't use this, but doesn't really need to (it's
a CI tool). It would be nice in the future to split out CLI utilities
like input/output formats from `linera-service` into a crate that can be
reüsed, and split `linera-service` into different crates that depend on
that.

## Test Plan

CI.  The existing test has been ported to the new structure.

## Release Plan

- Nothing to do / These changes follow the usual release cycle.

## Links

- [reviewer
checklist](https://github.com/linera-io/linera-protocol/blob/main/CONTRIBUTING.md#reviewer-checklist)

Author: Twey

.github/workflows/rust.yml

@@ -94,7 +94,7 @@ jobs:
     - uses: actions-rust-lang/setup-rust-toolchain@v1
     - name: Run metrics tests
       run: |
-        cargo test --locked -p linera-base --features metrics,opentelemetry
+        cargo test --locked -p linera-base --features metrics
 
   wasm-application-test:
     needs: changed-files

Cargo.lock

@@ -25,7 +25,7 @@ ARG binaries=
 ARG copy=${binaries:+_copy}
 ARG build_flag=--release
 ARG build_folder=release
-ARG build_features=scylladb,metrics,memory-profiling,opentelemetry
+ARG build_features=scylladb,metrics,memory-profiling
 ARG rustflags="-C force-frame-pointers=yes"
 
 FROM rust:1.74-slim-bookworm AS builder

docker/Dockerfile

@@ -18,7 +18,6 @@ workspace = true
 metrics = ["prometheus"]
 reqwest = ["dep:reqwest"]
 revm = []
-opentelemetry = ["opentelemetry-otlp"]
 test = ["test-strategy", "proptest"]
 web = [
     "getrandom/js",
@@ -50,7 +49,6 @@ ed25519-dalek.workspace = true
 futures.workspace = true
 getrandom = { workspace = true, optional = true }
 hex.workspace = true
-is-terminal.workspace = true
 k256.workspace = true
 linera-kywasmtime = { workspace = true, optional = true }
 linera-witty = { workspace = true, features = ["macros"] }
@@ -68,7 +66,6 @@ thiserror.workspace = true
 tokio = { workspace = true, features = ["time"] }
 tokio-stream.workspace = true
 tracing.workspace = true
-tracing-subscriber = { workspace = true, features = ["json", "fmt", "ansi"] }
 trait-variant.workspace = true
 wasm-bindgen = { workspace = true, optional = true }
 wasm-bindgen-futures = { workspace = true, optional = true }
@@ -82,11 +79,6 @@ tracing-web = { optional = true, workspace = true }
 
 [target.'cfg(not(target_arch = "wasm32"))'.dependencies]
 chrono.workspace = true
-opentelemetry.workspace = true
-opentelemetry-otlp = { workspace = true, optional = true }
-opentelemetry_sdk = { workspace = true, features = ["testing"] }
-tracing-chrome.workspace = true
-tracing-opentelemetry.workspace = true
 rand = { workspace = true, features = ["getrandom", "std", "std_rng"] }
 tokio = { workspace = true, features = [
     "process",

examples/Cargo.lock

@@ -38,10 +38,6 @@ pub mod vm;
 #[cfg(not(chain))]
 pub use task::Blocking;
 pub mod time;
-#[cfg_attr(web, path = "tracing_web.rs")]
-pub mod tracing;
-#[cfg(not(target_arch = "wasm32"))]
-pub mod tracing_opentelemetry;
 #[cfg(test)]
 mod unit_tests;