diff --git a/src/sync/mod.rs b/src/sync/mod.rs
index 59a4050..84c0d04 100644
--- a/src/sync/mod.rs
+++ b/src/sync/mod.rs
@@ -744,6 +744,10 @@ const CONSOLIDATION_THRESHOLD: usize = 70;
 /// exhaust network resources while keeping the sync actor responsive.
 const MAX_CONCURRENT_CONNECT_ATTEMPTS: usize = 8;
 
+/// Maximum number of collection members rendered in an INFO-level log field.
+/// Counts remain authoritative; samples keep remotely influenced logs bounded.
+const LOG_COLLECTION_SAMPLE_SIZE: usize = 5;
+
 /// Adaptive per-relay threshold for historic REQ+EOSE pagination.
 ///
 /// NIP-01 guarantees none of this; the model is empirical. A source audit of
@@ -2399,7 +2403,6 @@ impl SyncManager {
                 );
             }
 
-            // DEBUG TRACING: Log the root events being confirmed
             tracing::info!(
                 relay = %relay_url,
                 batch_id = batch_id,
@@ -2407,11 +2410,11 @@ impl SyncManager {
                 full_repos_confirmed = full_repos_count,
                 state_only_repos_confirmed = state_only_repos_count,
                 root_events_confirmed = events_count,
-                root_events_ids = ?batch.items.root_events.iter().map(|id| id.to_hex()).collect::<Vec<_>>(),
+                root_events_sample = ?batch.items.root_events.iter().take(LOG_COLLECTION_SAMPLE_SIZE).map(|id| id.to_hex()).collect::<Vec<_>>(),
                 total_full_repos = state.repos.len(),
                 total_state_only_repos = state.state_only_repos.len(),
                 total_root_events = state.root_events.len(),
-                all_root_events = ?state.root_events.iter().map(|id| id.to_hex()).collect::<Vec<_>>(),
+                all_root_events_sample = ?state.root_events.iter().take(LOG_COLLECTION_SAMPLE_SIZE).map(|id| id.to_hex()).collect::<Vec<_>>(),
                 is_generic_filter = is_generic_filter,
                 announcements_synced = state.announcements_synced,
                 had_failures = state.historic_sync_had_failures,
@@ -5148,7 +5151,7 @@ impl SyncManager {
 
         tracing::info!(
             count = to_disconnect.len(),
-            relays = ?to_disconnect,
+            relay_sample = ?to_disconnect.iter().take(LOG_COLLECTION_SAMPLE_SIZE).collect::<Vec<_>>(),
             "Found empty non-bootstrap relays to disconnect"
         );
 
@@ -5254,7 +5257,7 @@ impl SyncManager {
 
         tracing::info!(
             count = to_reconnect.len(),
-            relays = ?to_reconnect,
+            relay_sample = ?to_reconnect.iter().take(LOG_COLLECTION_SAMPLE_SIZE).collect::<Vec<_>>(),
             "Attempting reconnection for disconnected relays"
         );
 
diff --git a/src/sync/self_subscriber.rs b/src/sync/self_subscriber.rs
index c6c8f51..acef5df 100644
--- a/src/sync/self_subscriber.rs
+++ b/src/sync/self_subscriber.rs
@@ -20,6 +20,9 @@ use crate::nostr::SharedDatabase;
 
 use super::{AddFilters, RepoSyncIndex, RepoSyncNeeds, SyncLevel};
 
+/// Counts remain complete while remotely influenced log samples stay bounded.
+const LOG_COLLECTION_SAMPLE_SIZE: usize = 5;
+
 // =============================================================================
 // LoopControl - Result of notification processing
 // =============================================================================
@@ -275,7 +278,7 @@ impl SelfSubscriber {
                             event_id = %event.id,
                             repo_id = %repo_id,
                             relay_count = relays.len(),
-                            relays = ?relays,
+                            relay_sample = ?relays.iter().take(LOG_COLLECTION_SAMPLE_SIZE).collect::<Vec<_>>(),
                             "[DIAG] Queued 30617 announcement for batch processing"
                         );
                     }
@@ -574,7 +577,8 @@ impl SelfSubscriber {
         for (repo_id, needs) in &updates {
             tracing::info!(
                 repo_id = %repo_id,
-                relay_urls = ?needs.relays,
+                relay_count = needs.relays.len(),
+                relay_sample = ?needs.relays.iter().take(LOG_COLLECTION_SAMPLE_SIZE).collect::<Vec<_>>(),
                 "Discovered repo with relay URLs"
             );
         }