How to organize web application monitoring?

Question

Monitoring

Hello!
Prompt how to organize monitoring of Web application.
It consists of:

1. Flask - endpoints with API and HTML return
   
2. Asyncio for websocket in separate process
   
3. nginx proxy
   

Later the project will grow and I'm thinking of making a front on Node.js, now files with Vue code are given from the same server where Flask is.
How to monitor it? And how to manage it as a whole?

Answer 1

Take the monitoring system Zabbix (or analogues) and use its functionality. If something is missing, monitoring systems are usually extensible.
Well, or write your bike.
Actually, what needs to be configured or implemented:
If the simplest tests are written and logging is configured, then the monitoring is half ready.

Answer 2

I would look at solutions like:

• https://www.loggly.com/
  
• https://www.pagerduty.com/
  
• https://newrelic.com/
  

Answer 3

Suitable NMS - to monitor the availability of services within a local network or over the Internet.
Prometheus/InfluxDB + Grafana - collecting application metrics and plotting.
ELK - collection and search in logs.
Or their analogues in the form of cloud services.