queue collector exports on disk and retry without a time limit

nix/host-modules/otel.nix

@@ -526,6 +526,7 @@ in
             # samples get labelled as.
             endpoint = "https://${swarmOtelCfg.domain}" + lib.optionalString senderAuth "/${toString hiveName}";
           }
+          // import ../otel-export-queue.nix
           // lib.optionalAttrs senderAuth { auth.authenticator = authName; };
 
           # ⚠️ An extension not listed here is INERT: the collector starts

nix/host-modules/swarm-otel.nix

@@ -1264,6 +1264,7 @@ in
                 ${if upstream.protocol == "grpc" then "otlp" else "otlphttp"} = {
                   endpoint = upstream.endpoint;
                 }
+                // import ../otel-export-queue.nix
                 // lib.optionalAttrs (upstream.headersCredential != null) {
                   # Interpolated by the collector from its environment at
                   # runtime, never by nix: `EnvironmentFile` below is what
@@ -1296,6 +1297,7 @@ in
                   logs_endpoint =
                     logsPushUrl + "?_msg_field=MESSAGE&_stream_fields=_HOSTNAME,_MACHINE_ID,_SYSTEMD_UNIT";
                 }
+                // import ../otel-export-queue.nix
                 // lib.optionalAttrs haveCollectorSecret {
                   auth.authenticator = pushAuthenticator "victorialogs";
                 };