Enable sentry reporting

Cargo.toml

@@ -18,6 +18,8 @@ mwbot = { version = "0.7.0", default-features = false, features = ["generators",
 rand = "0.9.2"
 reqwest = "0.12.22"
 scraper = "0.24.0"
+sentry = { version = "0.45.0", features = ["tracing"] }
+sentry-tracing = { version = "0.45.0", features = ["backtrace", "logs"] }
 serde = { version = "1.0.219", features = ["derive"] }
 serde_plain = "1.0.2"
 thiserror = "2.0.12"

src/main.rs

@@ -24,6 +24,8 @@ use mwbot::{
     generators::{Generator, SortDirection, categories::CategoryMemberSort},
 };
 use std::path::Path;
+use tracing::level_filters::LevelFilter;
+use tracing_subscriber::{Layer, layer::SubscriberExt, util::SubscriberInitExt};
 
 use crate::watchdog::watch_wanted;
 
@@ -61,12 +63,47 @@ pub enum AppError {
 }
 
 fn main() -> Result<(), AppError> {
-    tracing_subscriber::fmt()
-        .with_level(true)
-        .with_max_level(tracing::Level::INFO)
-        .init();
-    tracing::info!("Starting {}", app_signature());
+    let fmt_filter = tracing_subscriber::fmt::layer().with_filter(
+        tracing_subscriber::EnvFilter::builder()
+            .with_default_directive(LevelFilter::INFO.into())
+            .from_env_lossy(),
+    );
+    let _guard = match std::fs::read_to_string("sentry_dsn.txt") {
+        Ok(dsn) => {
+            let guard = sentry::init((
+                dsn,
+                sentry::ClientOptions {
+                    release: sentry::release_name!(),
+                    traces_sample_rate: 1.0,
+                    ..Default::default()
+                },
+            ));
 
+            let sentry_layer = sentry::integrations::tracing::layer()
+                .event_filter(|md| match *md.level() {
+                    tracing::Level::ERROR => sentry_tracing::EventFilter::Event,
+                    _ => sentry_tracing::EventFilter::Ignore,
+                })
+                .span_filter(|md| {
+                    matches!(*md.level(), tracing::Level::ERROR | tracing::Level::WARN)
+                });
+
+            tracing_subscriber::registry()
+                .with(fmt_filter)
+                .with(sentry_layer)
+                .init();
+            tracing::info!("Starting {} with sentry", app_signature());
+
+            Some(guard)
+        }
+        Err(error) => {
+            tracing_subscriber::registry().with(fmt_filter).init();
+            tracing::warn!("Could not load 'sentry_dsn.txt': {}", error);
+            None
+        }
+    };
+
+    // Register the Sentry tracing layer to capture breadcrumbs, events, and spans:
     let rt = tokio::runtime::Builder::new_current_thread()
         .enable_all()
         .build()?;