fix: harden multi-pod delivery and load verification

docker/tinode/config.template

@@ -281,6 +281,11 @@
 	"cluster_config": {
 		"self": "",
 		"nodes": $CLUSTER_NODES_JSON,
+		"proxy_to_master_buffer": $CLUSTER_PROXY_TO_MASTER_BUFFER,
+		"proxy_to_master_workers": $CLUSTER_PROXY_TO_MASTER_WORKERS,
+		"proxy_to_master_enqueue_timeout_ms": $CLUSTER_PROXY_TO_MASTER_ENQUEUE_TIMEOUT_MS,
+		"route_retries": $CLUSTER_ROUTE_RETRIES,
+		"route_retry_backoff_ms": $CLUSTER_ROUTE_RETRY_BACKOFF_MS,
 		"failover": {
 			"enabled": true,
 			"heartbeat": 100,

docker/tinode/entrypoint.sh

@@ -13,6 +13,11 @@ else
 	CONFIG=working.config
 
 	: "${REDIS_KEY_PREFIX:=im}"
+	: "${CLUSTER_PROXY_TO_MASTER_BUFFER:=4096}"
+	: "${CLUSTER_PROXY_TO_MASTER_WORKERS:=16}"
+	: "${CLUSTER_PROXY_TO_MASTER_ENQUEUE_TIMEOUT_MS:=300}"
+	: "${CLUSTER_ROUTE_RETRIES:=3}"
+	: "${CLUSTER_ROUTE_RETRY_BACKOFF_MS:=25}"
 	if [ -z "$CLUSTER_NODES_JSON" ] ; then
 		CLUSTER_NODES_JSON='[{"name":"tinode-0","addr":"tinode-0:12000"},{"name":"tinode-1","addr":"tinode-1:12001"},{"name":"tinode-2","addr":"tinode-2:12002"}]'
 	fi