fix: harden multi-pod delivery and load verification

server/main.go

@@ -34,6 +34,7 @@ import (
 	_ "github.com/tinode/chat/server/auth/code"
 	_ "github.com/tinode/chat/server/auth/rest"
 	_ "github.com/tinode/chat/server/auth/token"
+	adapter "github.com/tinode/chat/server/db"
 	"github.com/tinode/chat/server/store/types"
 
 	// Database backends
@@ -516,6 +517,23 @@ func main() {
 		logs.Info.Println("All done, good bye")
 	}()
 	statsRegisterDbStats()
+	if kafkaConfigured(config.Kafka) {
+		tenants, tenantErr := store.Tenants.ListActive(10000)
+		if tenantErr != nil {
+			logs.Err.Fatal("Failed to list tenants for Kafka message schema validation:", tenantErr)
+		}
+		tenantIDs := make([]types.TenantID, 0, len(tenants))
+		for i := range tenants {
+			tenantIDs = append(tenantIDs, tenants[i].ID)
+		}
+		validator, ok := store.Store.GetAdapter().(adapter.TenantMessageSchemaAdapter)
+		if !ok {
+			logs.Err.Fatal("Kafka message persistence requires a message schema validator")
+		}
+		if err = validator.TenantMessageSchemaValidate(tenantIDs); err != nil {
+			logs.Err.Fatal("Kafka message persistence schema validation failed:", err)
+		}
+	}
 
 	if err = initKafkaRuntime(config.Kafka); err != nil {
 		logs.Err.Fatal("Failed to initialize Kafka:", err)
@@ -860,6 +878,7 @@ func main() {
 		mux.HandleFunc(sspath, serveStatus)
 	}
 	mux.HandleFunc("/healthz", serveHealthz)
+	mux.HandleFunc("/livez", serveLivez)
 	mux.HandleFunc("/metrics", serveMetrics)
 
 	// Public legal pages are opened directly by clients before login.