feat: add collectors and rules

scripts/lib/common.sh

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+vmcc_root() {
+  cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd
+}
+
+iso_utc_now() {
+  date -u "+%Y-%m-%dT%H:%M:%SZ"
+}
+
+run_id() {
+  local ts
+  ts="$(date -u "+%Y%m%dT%H%M%SZ")"
+  local rnd
+  rnd="$(head -c 8 /dev/urandom | od -An -tx1 | tr -d ' \n')"
+  echo "${ts}_${rnd:0:8}"
+}
+
+require_cmd() {
+  command -v "$1" >/dev/null 2>&1 || { echo "missing required tool: $1" >&2; exit 2; }
+}
+
+json_emit() {
+  printf '%s\n' "$1"
+}