How to monitor my Sei EVM node's health?

To effectively monitor your Sei EVM node's health:

1. Basic System Monitoring

# Check system resources
htop
df -h
free -m

# Check node process
ps aux | grep seid

2. Node-Specific Metrics

# Check sync status via RPC
curl -s -X POST -H "Content-Type: application/json" \
  --data '{"jsonrpc":"2.0","method":"eth_syncing","params":[],"id":1}' \
  http://localhost:8545

# Get current block height
curl -s -X POST -H "Content-Type: application/json" \
  --data '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":1}' \
  http://localhost:8545

# Check peer count
curl -s -X POST -H "Content-Type: application/json" \
  --data '{"jsonrpc":"2.0","method":"net_peerCount","params":[],"id":1}' \
  http://localhost:8545

3. Set Up Prometheus Monitoring

# Install Prometheus and Grafana

# Configure Prometheus in /etc/prometheus/prometheus.yml
scrape_configs:
  - job_name: 'sei_node'
    scrape_interval: 15s
    static_configs:
      - targets: ['localhost:26660']  # Default Tendermint metrics port

4. Create Alert Rules

# Example Prometheus alert rule
groups:
- name: sei-node-alerts
  rules:
  - alert: NodeBehind
    expr: (max(sei_latest_block_height) - sei_latest_block_height) > 10
    for: 5m
    labels:
      severity: warning
    annotations:
      summary: "Node falling behind"
      description: "Node is more than 10 blocks behind the network"

5. Health Check Script

#!/bin/bash
# health_check.sh - Run periodically via cron

# Check if node is syncing
SYNCING=$(curl -s -X POST -H "Content-Type: application/json" \
  --data '{"jsonrpc":"2.0","method":"eth_syncing","params":[],"id":1}' \
  http://localhost:8545 | jq '.result')

# Check block height
BLOCK_HEIGHT=$(curl -s -X POST -H "Content-Type: application/json" \
  --data '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":1}' \
  http://localhost:8545 | jq '.result')

# Check peer count
PEER_COUNT=$(curl -s -X POST -H "Content-Type: application/json" \
  --data '{"jsonrpc":"2.0","method":"net_peerCount","params":[],"id":1}' \
  http://localhost:8545 | jq '.result')

# Send alerts if issues detected
if [ "$SYNCING" != "false" ]; then
  echo "Node is still syncing" | mail -s "Sei Node Alert: Syncing" admin@example.com
fi

if [ "$PEER_COUNT" -lt "3" ]; then
  echo "Low peer count: $PEER_COUNT" | mail -s "Sei Node Alert: Low Peers" admin@example.com
fi

# Log health status
echo "$(date) - Block: $BLOCK_HEIGHT, Peers: $PEER_COUNT, Syncing: $SYNCING" >> /var/log/sei_health.log

6. Common Health Metrics to Monitor

• Block Height: Compare against network block height
• Sync Status: Whether node is fully synced
• Peer Count: Should maintain healthy number of peers
• Request Latency: Average response time for RPC requests
• Error Rate: Percentage of RPC requests returning errors
• Disk Usage: Blockchain data grows over time
• Memory Usage: Watch for memory leaks
• CPU Usage: Spikes during high transaction periods