feat(sentry): Add config for global tags (#211)

Add a config option to set global tags that will be added to all data
that the Sentry SDK is using. We will use this to differentiate the
deployments.

Author: jan-auer

objectstore-server/src/config.rs

@@ -450,6 +450,31 @@ pub struct Sentry {
     ///
     /// `OS__SENTRY__DEBUG`
     pub debug: bool,
+
+    /// Additional tags to attach to all Sentry events.
+    ///
+    /// Key-value pairs that are sent as tags with every event reported to Sentry. Useful for adding
+    /// context such as deployment identifiers or environment details.
+    ///
+    /// # Default
+    ///
+    /// Empty (no tags)
+    ///
+    /// # Environment Variables
+    ///
+    /// Each tag is set individually:
+    /// - `OS__SENTRY__TAGS__FOO=foo`
+    /// - `OS__SENTRY__TAGS__BAR=bar`
+    ///
+    /// # YAML Example
+    ///
+    /// ```yaml
+    /// sentry:
+    ///   tags:
+    ///     foo: foo
+    ///     bar: bar
+    /// ```
+    pub tags: BTreeMap<String, String>,
 }
 
 impl Sentry {
@@ -471,6 +496,7 @@ impl Default for Sentry {
             traces_sample_rate: 0.01,
             inherit_sampling_decision: true,
             debug: false,
+            tags: BTreeMap::new(),
         }
     }
 }

objectstore-server/src/observability.rs

@@ -25,7 +25,7 @@ pub fn init_sentry(config: &Config) -> Option<sentry::ClientInitGuard> {
     let config = &config.sentry;
     let dsn = config.dsn.as_ref()?;
 
-    Some(sentry::init(sentry::ClientOptions {
+    let guard = sentry::init(sentry::ClientOptions {
         dsn: dsn.expose_secret().parse().ok(),
         release: Some(RELEASE.into()),
         environment: config.environment.clone(),
@@ -47,7 +47,15 @@ pub fn init_sentry(config: &Config) -> Option<sentry::ClientInitGuard> {
         enable_logs: true,
         debug: config.debug,
         ..Default::default()
-    }))
+    });
+
+    sentry::configure_scope(|scope| {
+        for (k, v) in &config.tags {
+            scope.set_tag(k, v);
+        }
+    });
+
+    Some(guard)
 }
 
 pub fn init_tracing(config: &Config) {