Add support for chrome trace exporter (#4712)

## Motivation

Right now for tracing information we can only visualize it using Tempo,
which doesn't really work for local client runs.

## Proposal

Add support for `ChromeTraceExporter`, which generates a JSON file that
can be ingested by the Perfetto UI for visualization.

## Test Plan

Ran the client locally with the `OTEL_EXPORTER_TYPE=chrome_json`, got
the JSON file and managed to see the tracing data in the Perfetto UI

https://ui.perfetto.dev/#!/viewer?local_cache_key=00000000-0000-0000-f5e0-334428275111

## Release Plan

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

Author: ndr-ds

CLI.md

@@ -146,6 +146,9 @@ Client implementation and command-line tool for the Linera blockchain
 * `--max-retries <MAX_RETRIES>` — Number of times to retry connecting to a validator
 
   Default value: `10`
+* `--chrome-trace-exporter` — Enable OpenTelemetry Chrome JSON exporter for trace data analysis
+* `--otel-trace-file <OTEL_TRACE_FILE>` — Output file path for Chrome trace JSON format. Can be visualized in chrome://tracing or Perfetto UI
+* `--otel-exporter-otlp-endpoint <OTEL_EXPORTER_OTLP_ENDPOINT>` — OpenTelemetry OTLP exporter endpoint (requires tempo feature)
 * `--wait-for-outgoing-messages` — Whether to wait until a quorum of validators has confirmed that all sent cross-chain messages have been delivered
 * `--long-lived-services` — (EXPERIMENTAL) Whether application services can persist in some cases between queries
 * `--blanket-message-policy <BLANKET_MESSAGE_POLICY>` — The policy for handling incoming messages

Cargo.lock

@@ -260,6 +260,7 @@ tonic-web-wasm-client = "0.8.0"
 tower = "0.4.13"
 tower-http = "0.6.6"
 tracing = { version = "0.1.40", features = ["release_max_level_debug"] }
+tracing-chrome = "0.7.2"
 tracing-opentelemetry = "0.31.0"
 tracing-subscriber = { version = "0.3.18", default-features = false, features = [
     "env-filter",

Cargo.toml

@@ -18,12 +18,7 @@ workspace = true
 metrics = ["prometheus"]
 reqwest = ["dep:reqwest"]
 revm = []
-tempo = [
-    "opentelemetry",
-    "opentelemetry-otlp",
-    "opentelemetry_sdk",
-    "tracing-opentelemetry",
-]
+tempo = ["opentelemetry-otlp"]
 test = ["test-strategy", "proptest"]
 web = [
     "getrandom/js",
@@ -86,10 +81,11 @@ tracing-web = { optional = true, workspace = true }
 
 [target.'cfg(not(target_arch = "wasm32"))'.dependencies]
 chrono.workspace = true
-opentelemetry = { workspace = true, optional = true }
+opentelemetry.workspace = true
 opentelemetry-otlp = { workspace = true, optional = true }
-opentelemetry_sdk = { workspace = true, optional = true }
-tracing-opentelemetry = { workspace = true, optional = true }
+opentelemetry_sdk.workspace = true
+tracing-chrome.workspace = true
+tracing-opentelemetry.workspace = true
 rand = { workspace = true, features = ["getrandom", "std", "std_rng"] }
 tokio = { workspace = true, features = [
     "process",
@@ -107,6 +103,7 @@ assert_matches.workspace = true
 bcs.workspace = true
 linera-base = { path = ".", default-features = false, features = ["test"] }
 linera-witty = { workspace = true, features = ["test"] }
+tempfile.workspace = true
 test-case.workspace = true
 
 [build-dependencies]

examples/Cargo.lock

@@ -40,6 +40,8 @@ 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_otel;
 #[cfg(test)]
 mod unit_tests;