feat: add health check script (cron */5, 3 fails = alert)

scripts/health_check.sh

@@ -0,0 +1,58 @@
+#!/bin/bash
+# health_check.sh
+# 每5分钟 cron 执行，检查 freqtrade 是否存活
+# 连续3次异常则推送 Server酱 告警
+
+HEALTH_FILE="/tmp/freqtrade_health"
+MAX_FAILS=3
+SENDKEY="SCT361386TEDBtHzmIJ7wEoumDj5M1L8OZ"
+LOG_FILE="/home/ubuntu/freqtrade/user_data/logs/freqtrade.log"
+
+# 检查1: Docker 是否运行
+DOCKER_OK=$(docker ps --filter "name=freqtrade" --filter "status=running" -q | wc -l)
+
+# 检查2: 最近心跳（5分钟内）
+HEARTBEAT_OK=0
+if [ -f "$LOG_FILE" ]; then
+    LAST_HB=$(tail -100 "$LOG_FILE" | grep "Bot heartbeat" | tail -1 | grep -oP "^\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}")
+    if [ -n "$LAST_HB" ]; then
+        HB_TS=$(date -d "$LAST_HB" +%s 2>/dev/null)
+        NOW_TS=$(date +%s)
+        DIFF=$((NOW_TS - HB_TS))
+        if [ "$DIFF" -lt 300 ]; then
+            HEARTBEAT_OK=1
+        fi
+    fi
+fi
+
+# 累计失败次数
+if [ "$DOCKER_OK" -eq 0 ] || [ "$HEARTBEAT_OK" -eq 0 ]; then
+    if [ -f "$HEALTH_FILE" ]; then
+        FAILS=$(cat "$HEALTH_FILE")
+        FAILS=$((FAILS + 1))
+    else
+        FAILS=1
+    fi
+    echo "$FAILS" > "$HEALTH_FILE"
+    
+    if [ "$FAILS" -ge "$MAX_FAILS" ]; then
+        # 连续3次失败 → 推送告警
+        TITLE="⚠️ Freqtrade 异常告警"
+        DESP="## Freqtrade 异常告警\n\n"
+        DESP+="**时间**: $(date +%Y-%m-%d\ %H:%M:%S)\n\n"
+        DESP+="**Docker**: $([ "$DOCKER_OK" -eq 1 ] && echo "运行中" || echo "已停止")\n"
+        DESP+="**心跳**: $([ "$HEARTBEAT_OK" -eq 1 ] && echo "正常" || echo "异常")\n"
+        DESP+="**连续检查失败**: ${FAILS}次\n\n"
+        DESP+="请 SSH 检查:\n"
+        DESP+="\`\`\`\ndocker logs freqtrade --tail 30\n\`\`\`"
+        
+        curl -s -X POST "https://sctapi.ftqq.com/${SENDKEY}.send" \
+            -d "title=${TITLE}" \
+            -d "desp=${DESP}" > /dev/null 2>&1
+        echo "告警已推送"
+        rm -f "$HEALTH_FILE"
+    fi
+else
+    # 恢复正常 → 清除失败计数
+    rm -f "$HEALTH_FILE"
+fi