From 5854fe5a3a7c7e8f681264d3a4b27597a8c61de0 Mon Sep 17 00:00:00 2001
From: tv <tv@krebsco.de>
Date: Mon, 26 Oct 2026 20:48:45 +0100
Subject: add sync and relay stats

---
 src/api/stats/prometheus.rs | 68 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)

(limited to 'src/api/stats/prometheus.rs')

diff --git a/src/api/stats/prometheus.rs b/src/api/stats/prometheus.rs
index 6fd37a0..3baa125 100644
--- a/src/api/stats/prometheus.rs
+++ b/src/api/stats/prometheus.rs
@@ -112,6 +112,8 @@ struct Peer {
     neighbour: bool,
     dormant: bool,
     last_seen_secs: Option<f64>,
+    last_sync_secs: Option<f64>,
+    diverged_secs: Option<f64>,
     traffic: PeerTraffic,
     incidents: Incidents,
     rtt_secs: Option<f64>,
@@ -142,6 +144,12 @@ async fn peers(state: &AppState) -> Vec<Peer> {
             last_seen_secs: peer_state
                 .last_seen
                 .map(|t| now.saturating_duration_since(t).as_secs_f64()),
+            last_sync_secs: peer_state
+                .last_sync_rx
+                .map(|t| now.saturating_duration_since(t).as_secs_f64()),
+            diverged_secs: peer_state
+                .diverged_since
+                .map(|t| now.saturating_duration_since(t).as_secs_f64()),
             traffic,
             incidents: peer_state.incidents,
             rtt_secs,
@@ -303,6 +311,46 @@ pub(super) async fn render(state: &AppState, stats: &StatsResponse) -> String {
         remakes.archived_epochs as f64,
     );
 
+    if let Some(secs) = stats.sync.last_from_neighbour_secs {
+        out.single(
+            "last_sync_from_neighbour_seconds",
+            "gauge",
+            "Seconds since a sync message from any neighbour was applied.",
+            secs as f64,
+        );
+    }
+    out.single(
+        "diverged_peers",
+        "gauge",
+        "Peers whose heads differ from ours while sync is idle.",
+        stats.sync.diverged_peers as f64,
+    );
+    let relay = &stats.relay;
+    out.single(
+        "announce_rounds_total",
+        "counter",
+        "Announcement rounds (our new heads to the neighbours).",
+        relay.announce_rounds as f64,
+    );
+    out.single(
+        "pulls_total",
+        "counter",
+        "Pulls of changes we lacked, started.",
+        relay.pulls as f64,
+    );
+    out.single(
+        "pulls_queued_total",
+        "counter",
+        "Announcements of heads we lacked that waited for the pull in progress.",
+        relay.pulls_queued as f64,
+    );
+    out.single(
+        "blob_requests_dropped_total",
+        "counter",
+        "Blob requests not answered: too many were being answered.",
+        relay.blob_requests_dropped as f64,
+    );
+
     let topology = &stats.topology;
     out.single(
         "neighbours_target",
@@ -489,6 +537,26 @@ pub(super) async fn render(state: &AppState, stats: &StatsResponse) -> String {
             out.sample("peer_last_seen_seconds", &[("peer", &peer.key)], secs);
         }
     }
+    out.family(
+        "peer_last_sync_seconds",
+        "gauge",
+        "Seconds since a sync message from the peer was applied (or the epoch changed).",
+    );
+    for peer in &peers {
+        if let Some(secs) = peer.last_sync_secs {
+            out.sample("peer_last_sync_seconds", &[("peer", &peer.key)], secs);
+        }
+    }
+    out.family(
+        "peer_diverged_seconds",
+        "gauge",
+        "Seconds the peer's heads have differed from ours while sync was idle.",
+    );
+    for peer in &peers {
+        if let Some(secs) = peer.diverged_secs {
+            out.sample("peer_diverged_seconds", &[("peer", &peer.key)], secs);
+        }
+    }
     out.family(
         "peer_rtt_seconds",
         "gauge",
-- 
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