Initial metrics skill with aggregation

scripts/autorun.sh

@@ -0,0 +1,124 @@
+#!/bin/bash
+set -e
+
+NODE_EXPORTER_VERSION="${NODE_EXPORTER_VERSION:-1.7.0}"
+SKILLS_DIR="${SKILLS_DIR:-/skills}"
+
+# Idempotent node_exporter installation
+install_node_exporter() {
+    if command -v node_exporter &>/dev/null; then
+        echo "node_exporter already installed"
+        return 0
+    fi
+
+    echo "Installing node_exporter v${NODE_EXPORTER_VERSION}..."
+
+    local arch
+    case "$(uname -m)" in
+        x86_64)  arch="amd64" ;;
+        aarch64) arch="arm64" ;;
+        armv7l)  arch="armv7" ;;
+        *)
+            echo "Unsupported architecture: $(uname -m)"
+            exit 1
+            ;;
+    esac
+
+    local url="https://github.com/prometheus/node_exporter/releases/download/v${NODE_EXPORTER_VERSION}/node_exporter-${NODE_EXPORTER_VERSION}.linux-${arch}.tar.gz"
+
+    curl -sSL "$url" -o /tmp/node_exporter.tar.gz
+    tar -xzf /tmp/node_exporter.tar.gz -C /tmp
+    mv /tmp/node_exporter-*/node_exporter /usr/local/bin/
+    rm -rf /tmp/node_exporter*
+
+    echo "node_exporter installed"
+}
+
+# Discover skills with metrics ports
+discover_metrics_targets() {
+    local targets_file="/tmp/metrics_targets.txt"
+    echo "# Auto-discovered metrics targets" > "$targets_file"
+
+    for skill_dir in "$SKILLS_DIR"/*/; do
+        local skill_name=$(basename "$skill_dir")
+        local skill_md="$skill_dir/SKILL.md"
+
+        # Skip self
+        [ "$skill_name" = "metrics" ] && continue
+
+        # Check for metrics-port in SKILL.md
+        if [ -f "$skill_md" ]; then
+            local port=$(yq -r '.metadata.vibestack."metrics-port" // empty' < <(sed -n '/^---$/,/^---$/p' "$skill_md" | sed '1d;$d') 2>/dev/null)
+            if [ -n "$port" ] && [ "$port" != "null" ]; then
+                echo "$skill_name localhost:$port" >> "$targets_file"
+                echo "  $skill_name: metrics on port $port"
+            fi
+        fi
+
+        # Check for METRICS_PORT_skillname env var
+        local env_var="METRICS_PORT_${skill_name//-/_}"
+        local env_port="${!env_var}"
+        if [ -n "$env_port" ]; then
+            echo "$skill_name localhost:$env_port" >> "$targets_file"
+            echo "  $skill_name: metrics on port $env_port (from env)"
+        fi
+    done
+
+    echo "Targets written to $targets_file"
+}
+
+# Configure Caddy if present
+configure_caddy() {
+    local caddy_dir="$SKILLS_DIR/caddy"
+    local metrics_port="${METRICS_PORT:-9090}"
+    local metrics_domain="${METRICS_DOMAIN:-}"
+
+    if [ ! -d "$caddy_dir" ]; then
+        echo "Caddy not found - metrics on port $metrics_port"
+        return 0
+    fi
+
+    echo "Caddy detected - configuring reverse proxy..."
+    mkdir -p "$caddy_dir/snippets.d"
+
+    local snippet="$caddy_dir/snippets.d/metrics.caddy"
+
+    if [ -n "$metrics_domain" ]; then
+        cat > "$snippet" << EOF
+# Auto-generated by metrics skill
+$metrics_domain {
+    reverse_proxy localhost:$metrics_port
+}
+EOF
+        echo "Caddy config: $metrics_domain -> localhost:$metrics_port"
+    else
+        cat > "$snippet" << EOF
+# Auto-generated by metrics skill
+# Add to your site block:
+# handle /metrics {
+#     reverse_proxy localhost:$metrics_port
+# }
+EOF
+        echo "Caddy snippet created (manual config needed)"
+    fi
+}
+
+# Install socat for HTTP server
+install_socat() {
+    if command -v socat &>/dev/null; then
+        echo "socat already installed"
+        return 0
+    fi
+
+    echo "Installing socat..."
+    apt-get update
+    apt-get install -y socat
+    echo "socat installed"
+}
+
+install_node_exporter
+install_socat
+discover_metrics_targets
+configure_caddy
+
+echo "Metrics setup complete"