Opentelemetry instrumentation implementation

Cargo.toml

@@ -16,6 +16,18 @@ default-run = "electrs"
 liquid = ["elements"]
 electrum-discovery = ["electrum-client"]
 bench = []
+default = ["no-otlp-tracing"]
+otlp-tracing = [
+    "tracing/max_level_trace",
+    "tracing-subscriber",
+    "opentelemetry",
+    "tracing-opentelemetry",
+    "opentelemetry-otlp",
+    "opentelemetry-semantic-conventions"
+]
+no-otlp-tracing = [
+    "tracing/max_level_off"
+]
 
 [dependencies]
 arraydeque = "0.5.1"
@@ -54,12 +66,12 @@ hyper = "0.14"
 hyperlocal = "0.8"
 # close to same tokio version as dependent by hyper v0.14 and hyperlocal 0.8 -- things can go awry if they mismatch
 tokio = { version = "1", features = ["sync", "macros", "rt-multi-thread", "rt"] }
-opentelemetry = { version = "0.20.0", features = ["rt-tokio"] }
-tracing-opentelemetry = "0.21.0"
-opentelemetry-otlp = { version = "0.13.0", default-features = false, features = ["http-proto", "reqwest-client"] }
-tracing-subscriber = { version = "0.3.17", features = ["env-filter"] }
-opentelemetry-semantic-conventions = "0.12.0"
-tracing = { version = "0.1.40", features = ["async-await", "log"] }
+opentelemetry = { version = "0.20.0", features = ["rt-tokio"], optional = true }
+tracing-opentelemetry = {  version = "0.21.0", optional = true }
+opentelemetry-otlp = { version = "0.13.0", default-features = false, features = ["http-proto", "reqwest-client"], optional = true }
+tracing-subscriber = { version = "0.3.17", default-features = false, features = ["env-filter", "fmt"], optional = true }
+opentelemetry-semantic-conventions = { version = "0.12.0", optional = true }
+tracing = { version = "0.1.40", default-features = false, features = ["attributes"] }
 
 # optional dependencies for electrum-discovery
 electrum-client = { version = "0.8", optional = true }

src/bin/electrs.rs

@@ -21,6 +21,9 @@ use electrs::{
     signal::Waiter,
 };
 
+#[cfg(feature = "otlp-tracing")]
+use electrs::otlp_trace;
+
 #[cfg(feature = "liquid")]
 use electrs::elements::AssetRegistry;
 use electrs::metrics::MetricOpts;
@@ -148,10 +151,22 @@ fn run_server(config: Arc<Config>) -> Result<()> {
     Ok(())
 }
 
-fn main() {
+fn main_() {
     let config = Arc::new(Config::from_args());
     if let Err(e) = run_server(config) {
         error!("server failed: {}", e.display_chain());
         process::exit(1);
     }
 }
+
+#[cfg(feature = "no-otlp-tracing")]
+fn main() {
+    main_();
+}
+
+#[cfg(feature = "otlp-tracing")]
+#[tokio::main]
+async fn main() {
+    let _tracing_guard = otlp_trace::init_tracing("electrs");
+    main_()
+}

src/config.rs

@@ -405,6 +405,7 @@ impl Config {
             stderrlog::Timestamp::Off
         });
         log.init().expect("logging initialization failed");
+
         let config = Config {
             log,
             network_type,