fix: docs placement

apps/monitor/src/main.rs

@@ -23,9 +23,12 @@ async fn main() -> Result<()> {
         .unwrap_or_else(|_| "http://localhost:3000".into());
     let monitor_token = env::var("MONITOR_TOKEN")
         .expect("MONITOR_TOKEN must be set");
-    let region = env::var("REGION").unwrap_or_default();
+    // Region label this runner reports on every ping. "default" means the operator
+    // didn't pin this runner to a named region — it's still a meaningful label so
+    // alerts say where they came from instead of being blank.
+    let region = env::var("REGION").ok().filter(|s| !s.is_empty()).unwrap_or_else(|| "default".to_string());
 
-    info!("PingQL monitor starting, coordinator: {coordinator_url}, region: {}", if region.is_empty() { "all" } else { &region });
+    info!("PingQL monitor starting, coordinator: {coordinator_url}, region: {region}");
 
     let client = reqwest::Client::builder()
         .user_agent("PingQL-Monitor/0.1")

apps/monitor/src/runner.rs

@@ -25,11 +25,7 @@ pub async fn fetch_and_run(
     region: &str,
     in_flight: &Arc<Mutex<HashSet<String>>>,
 ) -> Result<usize> {
-    let url = if region.is_empty() {
-        format!("{coordinator_url}/internal/due?lookahead_ms=2000")
-    } else {
-        format!("{coordinator_url}/internal/due?region={}&lookahead_ms=2000", region)
-    };
+    let url = format!("{coordinator_url}/internal/due?region={region}&lookahead_ms=2000");
     let monitors: Vec<Monitor> = client
         .get(&url)
         .header("x-monitor-token", token)
@@ -103,7 +99,7 @@ pub async fn fetch_and_run(
                     error: Some(format!("timed out after {}ms", timeout_ms)),
                     cert_expiry_days: None,
                     meta: None,
-                    region: if region_owned.is_empty() { None } else { Some(region_owned.to_string()) },
+                    region: Some(region_owned.to_string()),
                     run_id: Some(run_id_owned.clone()),
                 },
             };
@@ -197,7 +193,7 @@ async fn run_check(client: &reqwest::Client, monitor: &Monitor, scheduled_at: Op
                 error: Some(e.clone()),
                 cert_expiry_days: None,
                 meta: None,
-                region: if region.is_empty() { None } else { Some(region.to_string()) },
+                region: Some(region.to_string()),
                 run_id: Some(run_id.to_string()),
             }
         },
@@ -262,7 +258,7 @@ async fn run_check(client: &reqwest::Client, monitor: &Monitor, scheduled_at: Op
                 error: query_error,
                 cert_expiry_days,
                 meta: Some(meta),
-                region: if region.is_empty() { None } else { Some(region.to_string()) },
+                region: Some(region.to_string()),
                 run_id: Some(run_id.to_string()),
             }
         }