Filter stale batches from live terminal logs

platform/api/log_events_handlers.go

@@ -14,6 +14,7 @@ import (
 
 const (
 	logEventHeartbeatInterval = 15 * time.Second
+	liveLogSourceClockSkew    = 90 * time.Second
 	managedLogSessionIDPrefix = "log-session:"
 )
 
@@ -23,6 +24,7 @@ func (h *coreHandlers) serverLogEvents(w http.ResponseWriter, r *http.Request) {
 		writeMethodNotAllowed(w, http.MethodGet)
 		return
 	}
+	liveBoundary := time.Now().UTC().Add(-liveLogSourceClockSkew)
 	instance, streams, liveEligible, subscription, err := h.openLogEventSubscription(r)
 	if err != nil {
 		writeServiceError(w, err)
@@ -129,6 +131,12 @@ func (h *coreHandlers) serverLogEvents(w http.ResponseWriter, r *http.Request) {
 			if !active.contains(event.Stream) {
 				continue
 			}
+			if !sourceLogEntryIsLive(event.Entry, liveBoundary) {
+				if event.Entry.Seq > emittedThrough[event.Stream.ID] {
+					emittedThrough[event.Stream.ID] = event.Entry.Seq
+				}
+				continue
+			}
 			if !active.hasStream(event.Stream.ID) {
 				active.streams = append(active.streams, event.Stream)
 				if err := writeSSEJSON(w, "stream", "", dto.LogStreamFromDomain(event.Stream)); err != nil {
@@ -152,6 +160,10 @@ func (h *coreHandlers) serverLogEvents(w http.ResponseWriter, r *http.Request) {
 	}
 }
 
+func sourceLogEntryIsLive(entry domain.LogEntry, liveBoundary time.Time) bool {
+	return !entry.Timestamp.IsZero() && !entry.Timestamp.Before(liveBoundary)
+}
+
 type supervisedLogSession struct {
 	sessionID string
 	startedAt time.Time