diff --git a/ROADMAP.md b/ROADMAP.md
index 87ab9ba..e61ed37 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -20,13 +20,15 @@
 - [ ] `widget-network-scan` Glance (tuile + popup) — reporté Phase 4
 - [ ] Résolution DNS inverse (PTR) — Phase 2+
 
-## Phase 3 — Métriques système
+## Phase 3 — Métriques système ✅
 
-- [ ] `agent-metric` : CPU/RAM/réseau (1s)
-- [ ] `agent-metric` : HDD/SMART (30min)
-- [ ] `agent-metric` : DMI/hardware (boot)
-- [ ] Événements système
-- [ ] `widget-agent-metrics` Glance
+- [x] `agent-metric` : CPU/RAM/réseau/charge (1s via sysinfo)
+- [x] `agent-metric` : disques, températures hwmon, SMART smartctl (30min)
+- [x] `agent-metric` : DMI/hardware/BIOS depuis /sys (boot + toutes les 30min)
+- [x] Événement boot envoyé au démarrage
+- [x] API locale sur :9101 (GET /metrics)
+- [x] Push vers /api/v1/metrics et /api/v1/events
+- [ ] `widget-agent-metrics` Glance — Phase 4
 
 ## Phase 4 — UX & Personnalisation
 
diff --git a/agents/agent-metric/Cargo.toml b/agents/agent-metric/Cargo.toml
index 6c12ed3..063eacf 100644
--- a/agents/agent-metric/Cargo.toml
+++ b/agents/agent-metric/Cargo.toml
@@ -4,10 +4,14 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
-tokio       = { workspace = true }
-serde       = { workspace = true }
-serde_json  = { workspace = true }
-anyhow      = { workspace = true }
-tracing     = { workspace = true }
+tokio              = { workspace = true }
+serde              = { workspace = true }
+serde_json         = { workspace = true }
+anyhow             = { workspace = true }
+tracing            = { workspace = true }
 tracing-subscriber = { workspace = true }
-axum        = "0.8"
+axum               = "0.8"
+serde_yaml         = "0.9"
+reqwest            = { version = "0.12", features = ["json"] }
+chrono             = { version = "0.4", features = ["serde"] }
+sysinfo            = "0.32"
diff --git a/agents/agent-metric/config.example.yaml b/agents/agent-metric/config.example.yaml
new file mode 100644
index 0000000..3105b04
--- /dev/null
+++ b/agents/agent-metric/config.example.yaml
@@ -0,0 +1,15 @@
+backend:
+  url: http://localhost:8080
+  token: ""
+
+agent:
+  id: ""              # auto-généré : metric-<hostname>
+  hostname: ""        # auto-détecté depuis /etc/hostname
+
+intervals:
+  realtime_ms: 1000   # CPU, RAM, réseau, charge
+  medium_s: 1800      # disques, températures, SMART
+  # DMI/hardware collecté au démarrage puis toutes les 12h
+
+api:
+  listen: "0.0.0.0:9101"
diff --git a/agents/agent-metric/src/api.rs b/agents/agent-metric/src/api.rs
new file mode 100644
index 0000000..95e3747
--- /dev/null
+++ b/agents/agent-metric/src/api.rs
@@ -0,0 +1,36 @@
+use std::sync::Arc;
+
+use axum::{extract::State, routing::get, Json, Router};
+use tokio::sync::RwLock;
+use tracing::info;
+
+use crate::collectors::{medium::MediumMetrics, realtime::RealtimeMetrics, static_info::StaticInfo};
+
+#[derive(Clone, Default)]
+pub struct AgentState {
+    pub realtime: RealtimeMetrics,
+    pub medium:   MediumMetrics,
+    pub hardware: Option<StaticInfo>,
+}
+
+pub type SharedState = Arc<RwLock<AgentState>>;
+
+pub async fn serve(listen: String, state: SharedState) {
+    let app = Router::new()
+        .route("/metrics",  get(get_metrics))
+        .route("/health",   get(|| async { "ok" }))
+        .with_state(state);
+
+    info!("API locale agent-metric sur http://{listen}");
+    let listener = tokio::net::TcpListener::bind(&listen).await.expect("bind API locale");
+    axum::serve(listener, app).await.expect("API locale");
+}
+
+async fn get_metrics(State(state): State<SharedState>) -> Json<serde_json::Value> {
+    let s = state.read().await;
+    Json(serde_json::json!({
+        "realtime": s.realtime,
+        "medium":   s.medium,
+        "hardware": s.hardware,
+    }))
+}
diff --git a/agents/agent-metric/src/backend.rs b/agents/agent-metric/src/backend.rs
new file mode 100644
index 0000000..60a9a55
--- /dev/null
+++ b/agents/agent-metric/src/backend.rs
@@ -0,0 +1,107 @@
+use anyhow::Result;
+use reqwest::Client;
+use serde_json::{json, Value};
+use tracing::warn;
+
+use crate::{
+    collectors::{medium::MediumMetrics, realtime::RealtimeMetrics, static_info::StaticInfo},
+    config::Config,
+};
+
+pub struct BackendClient {
+    client:   Client,
+    base_url: String,
+    token:    String,
+}
+
+impl BackendClient {
+    pub fn new(cfg: &Config) -> Self {
+        Self {
+            client:   Client::builder()
+                .timeout(std::time::Duration::from_secs(10))
+                .build()
+                .expect("client HTTP valide"),
+            base_url: cfg.backend.url.trim_end_matches('/').to_string(),
+            token:    cfg.backend.token.clone(),
+        }
+    }
+
+    pub async fn register(&self, cfg: &Config) -> Result<()> {
+        let body = json!({
+            "id":         cfg.agent.id,
+            "hostname":   cfg.agent.hostname,
+            "agent_type": "metric",
+            "ip":         local_ip(),
+            "version":    env!("CARGO_PKG_VERSION"),
+        });
+        self.post("/api/v1/agents", &body).await
+    }
+
+    pub async fn push_realtime(&self, agent_id: &str, m: &RealtimeMetrics) -> Result<()> {
+        let body = json!({
+            "agent_id":    agent_id,
+            "cpu_percent": m.cpu_percent,
+            "ram_percent": m.ram_percent,
+            "load_avg":    m.load_avg_1,
+            "net_rx_bps":  m.net_rx_bps,
+            "net_tx_bps":  m.net_tx_bps,
+        });
+        self.post("/api/v1/metrics", &body).await
+    }
+
+    pub async fn push_medium(&self, agent_id: &str, m: &MediumMetrics) -> Result<()> {
+        let body = json!({
+            "agent_id":    agent_id,
+            "disk_percent": m.disk_percent,
+            "temperature_c": m.temperatures.iter()
+                .filter(|t| t.label.contains("cpu") || t.label.contains("coretemp") || t.label.contains("k10temp"))
+                .map(|t| t.temp_c)
+                .next()
+                .unwrap_or(0.0),
+            "extra": {
+                "disks":        m.disks,
+                "temperatures": m.temperatures,
+            }
+        });
+        self.post("/api/v1/metrics", &body).await
+    }
+
+    pub async fn push_static(&self, agent_id: &str, info: &StaticInfo) -> Result<()> {
+        let body = json!({
+            "agent_id":  agent_id,
+            "event_type": "hardware_info",
+            "data": info,
+        });
+        self.post("/api/v1/events", &body).await
+    }
+
+    async fn post(&self, path: &str, body: &Value) -> Result<()> {
+        let resp = self
+            .client
+            .post(format!("{}{path}", self.base_url))
+            .bearer_auth(&self.token)
+            .json(body)
+            .send()
+            .await?;
+
+        if !resp.status().is_success() {
+            warn!("Backend {path} → HTTP {}", resp.status());
+        }
+        Ok(())
+    }
+}
+
+pub async fn push_event(client: &BackendClient, agent_id: &str, event_type: &str, data: Value) -> Result<()> {
+    let body = json!({
+        "agent_id":   agent_id,
+        "event_type": event_type,
+        "data":       data,
+    });
+    client.post("/api/v1/events", &body).await
+}
+
+fn local_ip() -> String {
+    std::net::UdpSocket::bind("0.0.0.0:0")
+        .and_then(|s| { s.connect("8.8.8.8:80")?; s.local_addr().map(|a| a.ip().to_string()) })
+        .unwrap_or_else(|_| "0.0.0.0".into())
+}
diff --git a/agents/agent-metric/src/collectors/medium.rs b/agents/agent-metric/src/collectors/medium.rs
new file mode 100644
index 0000000..83e91be
--- /dev/null
+++ b/agents/agent-metric/src/collectors/medium.rs
@@ -0,0 +1,125 @@
+use serde::{Deserialize, Serialize};
+use sysinfo::Disks;
+use tracing::warn;
+
+#[derive(Debug, Clone, Serialize, Deserialize, Default)]
+pub struct MediumMetrics {
+    pub disks:        Vec<DiskInfo>,
+    pub temperatures: Vec<TempSensor>,
+    pub disk_percent: f64,   // usage global (partition la plus chargée)
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct DiskInfo {
+    pub name:        String,
+    pub mount:       String,
+    pub total_gb:    f64,
+    pub used_gb:     f64,
+    pub percent:     f64,
+    pub smart_ok:    Option<bool>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct TempSensor {
+    pub label:   String,
+    pub temp_c:  f64,
+}
+
+pub fn collect() -> MediumMetrics {
+    let disks   = collect_disks();
+    let temps   = collect_temperatures();
+    let max_pct = disks.iter().map(|d| d.percent).fold(0.0_f64, f64::max);
+
+    MediumMetrics { disks, temperatures: temps, disk_percent: max_pct }
+}
+
+fn collect_disks() -> Vec<DiskInfo> {
+    let mut sys_disks = Disks::new_with_refreshed_list();
+    sys_disks.refresh();
+
+    sys_disks
+        .iter()
+        .filter(|d| d.total_space() > 0)
+        .map(|d| {
+            let total = d.total_space();
+            let avail = d.available_space();
+            let used  = total.saturating_sub(avail);
+            let pct   = if total > 0 { used as f64 / total as f64 * 100.0 } else { 0.0 };
+
+            // SMART via smartctl (optionnel — peut échouer sans root)
+            let smart_ok = smart_status(d.name().to_string_lossy().as_ref());
+
+            DiskInfo {
+                name:     d.name().to_string_lossy().into_owned(),
+                mount:    d.mount_point().to_string_lossy().into_owned(),
+                total_gb: total as f64 / 1e9,
+                used_gb:  used  as f64 / 1e9,
+                percent:  pct,
+                smart_ok,
+            }
+        })
+        .collect()
+}
+
+fn smart_status(device: &str) -> Option<bool> {
+    // Filtre les pseudo-systèmes de fichiers
+    if !device.starts_with("/dev/") {
+        return None;
+    }
+    let out = std::process::Command::new("smartctl")
+        .args(["-H", device])
+        .output()
+        .ok()?;
+
+    let stdout = String::from_utf8_lossy(&out.stdout);
+    if stdout.contains("PASSED") {
+        Some(true)
+    } else if stdout.contains("FAILED") {
+        Some(false)
+    } else {
+        None
+    }
+}
+
+fn collect_temperatures() -> Vec<TempSensor> {
+    // Lecture des capteurs hwmon Linux : /sys/class/hwmon/hwmonN/tempN_input
+    let mut sensors = Vec::new();
+
+    let Ok(hwmon_dir) = std::fs::read_dir("/sys/class/hwmon") else {
+        return sensors;
+    };
+
+    for entry in hwmon_dir.flatten() {
+        let hwmon_path = entry.path();
+        let name = std::fs::read_to_string(hwmon_path.join("name"))
+            .map(|s| s.trim().to_string())
+            .unwrap_or_else(|_| entry.file_name().to_string_lossy().into_owned());
+
+        // Scan des fichiers temp*_input
+        let Ok(files) = std::fs::read_dir(&hwmon_path) else { continue };
+        for f in files.flatten() {
+            let fname = f.file_name().to_string_lossy().into_owned();
+            if !fname.starts_with("temp") || !fname.ends_with("_input") {
+                continue;
+            }
+            let Ok(raw) = std::fs::read_to_string(f.path()) else { continue };
+            let Ok(millic) = raw.trim().parse::<i64>() else { continue };
+            let temp_c = millic as f64 / 1000.0;
+
+            // Libellé depuis temp*_label
+            let label_file = fname.replace("_input", "_label");
+            let label = std::fs::read_to_string(hwmon_path.join(label_file))
+                .map(|s| format!("{name}/{}", s.trim()))
+                .unwrap_or_else(|_| format!("{name}/{}", fname.replace("_input", "")));
+
+            if temp_c > 0.0 && temp_c < 150.0 {
+                sensors.push(TempSensor { label, temp_c });
+            }
+        }
+    }
+
+    if sensors.is_empty() {
+        warn!("Aucun capteur de température trouvé dans /sys/class/hwmon");
+    }
+    sensors
+}
diff --git a/agents/agent-metric/src/collectors/mod.rs b/agents/agent-metric/src/collectors/mod.rs
new file mode 100644
index 0000000..2336abb
--- /dev/null
+++ b/agents/agent-metric/src/collectors/mod.rs
@@ -0,0 +1,3 @@
+pub mod medium;
+pub mod realtime;
+pub mod static_info;
diff --git a/agents/agent-metric/src/collectors/realtime.rs b/agents/agent-metric/src/collectors/realtime.rs
new file mode 100644
index 0000000..1204a43
--- /dev/null
+++ b/agents/agent-metric/src/collectors/realtime.rs
@@ -0,0 +1,89 @@
+use serde::{Deserialize, Serialize};
+use sysinfo::{Networks, System};
+
+#[derive(Debug, Clone, Serialize, Deserialize, Default)]
+pub struct RealtimeMetrics {
+    pub cpu_percent:   f64,
+    pub ram_percent:   f64,
+    pub ram_used_mb:   u64,
+    pub ram_total_mb:  u64,
+    pub load_avg_1:    f64,
+    pub net_rx_bps:    i64,
+    pub net_tx_bps:    i64,
+    pub top_processes: Vec<ProcessInfo>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ProcessInfo {
+    pub name:        String,
+    pub cpu_percent: f64,
+    pub ram_mb:      u64,
+}
+
+pub struct RealtimeCollector {
+    sys:      System,
+    networks: Networks,
+    // Valeurs précédentes pour calculer le débit réseau
+    prev_rx:  u64,
+    prev_tx:  u64,
+}
+
+impl RealtimeCollector {
+    pub fn new() -> Self {
+        let mut sys = System::new_all();
+        sys.refresh_all();
+        let networks = Networks::new_with_refreshed_list();
+        Self { sys, networks, prev_rx: 0, prev_tx: 0 }
+    }
+
+    pub fn collect(&mut self, interval_ms: u64) -> RealtimeMetrics {
+        self.sys.refresh_cpu_usage();
+        self.sys.refresh_memory();
+        self.sys.refresh_processes(sysinfo::ProcessesToUpdate::All, true);
+        self.networks.refresh();
+
+        let cpu = self.sys.global_cpu_usage() as f64;
+
+        let ram_used  = self.sys.used_memory();
+        let ram_total = self.sys.total_memory();
+        let ram_pct   = if ram_total > 0 { ram_used as f64 / ram_total as f64 * 100.0 } else { 0.0 };
+
+        let load = System::load_average();
+
+        // Débit réseau (delta depuis la dernière mesure)
+        let (rx, tx): (u64, u64) = self
+            .networks
+            .iter()
+            .fold((0, 0), |(r, t), (_, n)| (r + n.total_received(), t + n.total_transmitted()));
+
+        let interval_s = interval_ms.max(1) as f64 / 1000.0;
+        let rx_bps = ((rx.saturating_sub(self.prev_rx)) as f64 / interval_s) as i64;
+        let tx_bps = ((tx.saturating_sub(self.prev_tx)) as f64 / interval_s) as i64;
+        self.prev_rx = rx;
+        self.prev_tx = tx;
+
+        // Top 5 processus par CPU
+        let mut procs: Vec<_> = self.sys.processes().values().collect();
+        procs.sort_by(|a, b| b.cpu_usage().partial_cmp(&a.cpu_usage()).unwrap_or(std::cmp::Ordering::Equal));
+        let top_processes = procs
+            .iter()
+            .take(5)
+            .map(|p| ProcessInfo {
+                name:        p.name().to_string_lossy().into_owned(),
+                cpu_percent: p.cpu_usage() as f64,
+                ram_mb:      p.memory() / 1024 / 1024,
+            })
+            .collect();
+
+        RealtimeMetrics {
+            cpu_percent:  cpu,
+            ram_percent:  ram_pct,
+            ram_used_mb:  ram_used / 1024 / 1024,
+            ram_total_mb: ram_total / 1024 / 1024,
+            load_avg_1:   load.one,
+            net_rx_bps:   rx_bps,
+            net_tx_bps:   tx_bps,
+            top_processes,
+        }
+    }
+}
diff --git a/agents/agent-metric/src/collectors/static_info.rs b/agents/agent-metric/src/collectors/static_info.rs
new file mode 100644
index 0000000..bb5f50a
--- /dev/null
+++ b/agents/agent-metric/src/collectors/static_info.rs
@@ -0,0 +1,92 @@
+use serde::{Deserialize, Serialize};
+use sysinfo::{Networks, System};
+use tracing::warn;
+
+#[derive(Debug, Clone, Serialize, Deserialize, Default)]
+pub struct StaticInfo {
+    pub hostname:         String,
+    pub os_name:          String,
+    pub os_version:       String,
+    pub kernel:           String,
+    pub cpu_model:        String,
+    pub cpu_cores:        usize,
+    pub ram_total_mb:     u64,
+    pub dmi:              DmiInfo,
+    pub network_ifaces:   Vec<IfaceInfo>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, Default)]
+pub struct DmiInfo {
+    pub board_vendor:     String,
+    pub board_name:       String,
+    pub product_name:     String,
+    pub bios_vendor:      String,
+    pub bios_version:     String,
+    pub bios_date:        String,
+    pub sys_vendor:       String,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct IfaceInfo {
+    pub name:     String,
+    pub mac:      String,
+    pub rx_total: u64,
+    pub tx_total: u64,
+}
+
+pub fn collect() -> StaticInfo {
+    let mut sys = System::new_all();
+    sys.refresh_all();
+
+    let cpu_model = sys
+        .cpus()
+        .first()
+        .map(|c| c.brand().to_string())
+        .unwrap_or_default();
+
+    let networks = Networks::new_with_refreshed_list();
+    let network_ifaces = networks
+        .iter()
+        .map(|(name, n)| IfaceInfo {
+            name:     name.clone(),
+            mac:      n.mac_address().to_string(),
+            rx_total: n.total_received(),
+            tx_total: n.total_transmitted(),
+        })
+        .collect();
+
+    StaticInfo {
+        hostname:       System::host_name().unwrap_or_default(),
+        os_name:        System::name().unwrap_or_default(),
+        os_version:     System::os_version().unwrap_or_default(),
+        kernel:         System::kernel_version().unwrap_or_default(),
+        cpu_model,
+        cpu_cores:      sys.cpus().len(),
+        ram_total_mb:   sys.total_memory() / 1024 / 1024,
+        dmi:            read_dmi(),
+        network_ifaces,
+    }
+}
+
+fn dmi_read(file: &str) -> String {
+    std::fs::read_to_string(format!("/sys/devices/virtual/dmi/id/{file}"))
+        .map(|s| s.trim().to_string())
+        .unwrap_or_default()
+}
+
+fn read_dmi() -> DmiInfo {
+    let info = DmiInfo {
+        board_vendor:  dmi_read("board_vendor"),
+        board_name:    dmi_read("board_name"),
+        product_name:  dmi_read("product_name"),
+        bios_vendor:   dmi_read("bios_vendor"),
+        bios_version:  dmi_read("bios_version"),
+        bios_date:     dmi_read("bios_date"),
+        sys_vendor:    dmi_read("sys_vendor"),
+    };
+
+    if info.board_name.is_empty() {
+        warn!("DMI non disponible (exécuter avec accès /sys/devices/virtual/dmi/id/)");
+    }
+    info
+}
diff --git a/agents/agent-metric/src/config.rs b/agents/agent-metric/src/config.rs
new file mode 100644
index 0000000..708b14d
--- /dev/null
+++ b/agents/agent-metric/src/config.rs
@@ -0,0 +1,52 @@
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Clone, Deserialize, Serialize)]
+pub struct Config {
+    pub backend:   BackendConfig,
+    pub agent:     AgentConfig,
+    pub intervals: IntervalsConfig,
+    pub api:       ApiConfig,
+}
+
+#[derive(Debug, Clone, Deserialize, Serialize)]
+pub struct BackendConfig {
+    pub url:   String,
+    pub token: String,
+}
+
+#[derive(Debug, Clone, Deserialize, Serialize)]
+pub struct AgentConfig {
+    pub id:       String,
+    pub hostname: String,
+}
+
+#[derive(Debug, Clone, Deserialize, Serialize)]
+pub struct IntervalsConfig {
+    pub realtime_ms: u64,
+    pub medium_s:    u64,
+}
+
+#[derive(Debug, Clone, Deserialize, Serialize)]
+pub struct ApiConfig {
+    pub listen: String,
+}
+
+impl Config {
+    pub fn load(path: &str) -> anyhow::Result<Self> {
+        let content = std::fs::read_to_string(path)?;
+        let mut cfg: Config = serde_yaml::from_str(&content)?;
+        cfg.resolve_defaults();
+        Ok(cfg)
+    }
+
+    fn resolve_defaults(&mut self) {
+        if self.agent.hostname.is_empty() {
+            self.agent.hostname = std::fs::read_to_string("/etc/hostname")
+                .map(|s| s.trim().to_string())
+                .unwrap_or_else(|_| "unknown".into());
+        }
+        if self.agent.id.is_empty() {
+            self.agent.id = format!("metric-{}", self.agent.hostname);
+        }
+    }
+}
diff --git a/agents/agent-metric/src/main.rs b/agents/agent-metric/src/main.rs
index 7815b72..a0f8d1e 100644
--- a/agents/agent-metric/src/main.rs
+++ b/agents/agent-metric/src/main.rs
@@ -1,18 +1,89 @@
-use tracing::info;
+use std::sync::Arc;
+
+use serde_json::json;
+use tokio::{sync::RwLock, time};
+use tracing::{error, info};
 use tracing_subscriber::EnvFilter;
 
+mod api;
+mod backend;
+mod collectors;
+mod config;
+
 #[tokio::main]
 async fn main() -> anyhow::Result<()> {
     tracing_subscriber::fmt()
-        .with_env_filter(EnvFilter::from_default_env())
+        .with_env_filter(EnvFilter::from_default_env().add_directive("info".parse()?))
         .init();
 
-    info!("agent-metric démarré");
+    let config_path = std::env::args().nth(1).unwrap_or_else(|| "config.yaml".into());
+    let cfg = config::Config::load(&config_path)?;
+    info!("Agent ID : {} | hostname : {}", cfg.agent.id, cfg.agent.hostname);
 
-    // TODO Phase 3 : collecte CPU/RAM/GPU/réseau (1s)
-    // TODO Phase 3 : collecte HDD/SMART/températures (30min)
-    // TODO Phase 3 : collecte DMI/hardware/BIOS (boot)
-    // TODO Phase 3 : événements système
+    let client = backend::BackendClient::new(&cfg);
 
-    Ok(())
+    // Enregistrement initial
+    if let Err(e) = client.register(&cfg).await {
+        error!("Enregistrement backend : {e}");
+    }
+
+    // Collecte hardware au démarrage
+    let hardware = collectors::static_info::collect();
+    info!("Hardware : {} — {} cœurs — {} Mo RAM", hardware.cpu_model, hardware.cpu_cores, hardware.ram_total_mb);
+    if let Err(e) = client.push_static(&cfg.agent.id, &hardware).await {
+        error!("Push hardware : {e}");
+    }
+
+    // Événement boot
+    if let Err(e) = backend::push_event(&client, &cfg.agent.id, "boot", json!({ "hostname": cfg.agent.hostname })).await {
+        error!("Push événement boot : {e}");
+    }
+
+    // État partagé avec l'API locale
+    let shared = Arc::new(RwLock::new(api::AgentState {
+        hardware: Some(hardware),
+        ..Default::default()
+    }));
+
+    // API locale (tâche de fond)
+    let api_state  = shared.clone();
+    let api_listen = cfg.api.listen.clone();
+    tokio::spawn(async move { api::serve(api_listen, api_state).await });
+
+    // Collecteur temps réel
+    let mut rt_collector = collectors::realtime::RealtimeCollector::new();
+    let realtime_interval = time::Duration::from_millis(cfg.intervals.realtime_ms);
+    let medium_interval   = time::Duration::from_secs(cfg.intervals.medium_s);
+
+    // Première collecte medium au démarrage
+    let medium = collectors::medium::collect();
+    shared.write().await.medium = medium.clone();
+    if let Err(e) = client.push_medium(&cfg.agent.id, &medium).await {
+        error!("Push medium initial : {e}");
+    }
+
+    // Minuteries
+    let mut rt_ticker = time::interval(realtime_interval);
+    let mut med_ticker = time::interval(medium_interval);
+    med_ticker.tick().await; // consomme le premier tick immédiat
+
+    loop {
+        tokio::select! {
+            _ = rt_ticker.tick() => {
+                let metrics = rt_collector.collect(cfg.intervals.realtime_ms);
+                shared.write().await.realtime = metrics.clone();
+                if let Err(e) = client.push_realtime(&cfg.agent.id, &metrics).await {
+                    error!("Push temps réel : {e}");
+                }
+            }
+            _ = med_ticker.tick() => {
+                info!("Collecte medium (disques, températures)…");
+                let metrics = collectors::medium::collect();
+                shared.write().await.medium = metrics.clone();
+                if let Err(e) = client.push_medium(&cfg.agent.id, &metrics).await {
+                    error!("Push medium : {e}");
+                }
+            }
+        }
+    }
 }