feat: jitter_ms tracking — scheduled_at stamped at dispatch, jitter computed on ingest

apps/monitor/src/runner.rs

@@ -44,7 +44,7 @@ pub async fn fetch_and_run(
         let token = token.to_string();
         let in_flight = in_flight.clone();
         tokio::spawn(async move {
-            let result = run_check(&client, &monitor).await;
+            let result = run_check(&client, &monitor, monitor.scheduled_at.clone()).await;
             // Remove from in-flight before posting so a fast next cycle can pick it up
             in_flight.lock().await.remove(&monitor.id);
             if let Err(e) = post_result(&client, &coordinator_url, &token, result).await {
@@ -56,7 +56,7 @@ pub async fn fetch_and_run(
     Ok(spawned)
 }
 
-async fn run_check(client: &reqwest::Client, monitor: &Monitor) -> PingResult {
+async fn run_check(client: &reqwest::Client, monitor: &Monitor, scheduled_at: Option<String>) -> PingResult {
     let start = Instant::now();
 
     // Check cert expiry for HTTPS URLs
@@ -96,6 +96,7 @@ async fn run_check(client: &reqwest::Client, monitor: &Monitor) -> PingResult {
     match result {
         Err(e) => PingResult {
             monitor_id: monitor.id.clone(),
+            scheduled_at,
             status_code: None,
             latency_ms: Some(latency_ms),
             up: false,
@@ -142,6 +143,7 @@ async fn run_check(client: &reqwest::Client, monitor: &Monitor) -> PingResult {
 
             PingResult {
                 monitor_id: monitor.id.clone(),
+                scheduled_at,
                 status_code: Some(status),
                 latency_ms: Some(latency_ms),
                 up,

apps/monitor/src/types.rs

@@ -12,11 +12,13 @@ pub struct Monitor {
     pub timeout_ms:      Option<u64>,
     pub interval_s:      i64,
     pub query:           Option<Value>,
+    pub scheduled_at:    Option<String>,
 }
 
 #[derive(Debug, Serialize)]
 pub struct PingResult {
     pub monitor_id:       String,
+    pub scheduled_at:     Option<String>,
     pub status_code:      Option<u16>,
     pub latency_ms:       Option<u64>,
     pub up:               bool,