docs+examples: document direction=ingress|egress, initiator and error_type enums; add cardinality relabel tips; provide Collector variants; add scripts/smoke-metrics.sh

scripts/smoke-metrics.sh

@@ -0,0 +1,42 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+NEWTHOST=${NEWTHOST:-localhost}
+NEWTPORT=${NEWTPORT:-2112}
+METRICS_URL="http://${NEWTHOST}:${NEWTPORT}/metrics"
+
+probe() {
+  local name=$1
+  local pattern=$2
+  echo "[probe] ${name}"
+  curl -sf "${METRICS_URL}" | grep -E "${pattern}" || {
+    echo "[warn] ${name} not found"
+    return 1
+  }
+}
+
+# Basic presence
+probe "newt_* presence" "^newt_" || true
+
+# Site gauges with site_id
+probe "site_online with site_id" "^newt_site_online\{.*site_id=\"[^\"]+\"" || true
+probe "last_heartbeat with site_id" "^newt_site_last_heartbeat_seconds\{.*site_id=\"[^\"]+\"" || true
+
+# Bytes with direction ingress/egress and protocol
+probe "tunnel bytes ingress" "^newt_tunnel_bytes_total\{.*direction=\"ingress\".*protocol=\"(tcp|udp)\"" || true
+probe "tunnel bytes egress" "^newt_tunnel_bytes_total\{.*direction=\"egress\".*protocol=\"(tcp|udp)\"" || true
+
+# WebSocket metrics (when OTLP/WS used)
+probe "websocket connect latency buckets" "^newt_websocket_connect_latency_seconds_bucket" || true
+probe "websocket messages total" "^newt_websocket_messages_total\{.*(direction|msg_type)=" || true
+
+# Proxy metrics (when proxy active)
+probe "proxy active connections" "^newt_proxy_active_connections\{" || true
+probe "proxy buffer bytes" "^newt_proxy_buffer_bytes\{" || true
+probe "proxy drops total" "^newt_proxy_drops_total\{" || true
+
+# Config apply
+probe "config apply seconds buckets" "^newt_config_apply_seconds_bucket\{" || true
+
+echo "Smoke checks completed (warnings above are acceptable if the feature isn't exercised yet)."
+