What methods can you use to obtain data about the status of services, besides using Prometheus?

Besides Prometheus, the following methods can be used to obtain service health data:

• Health Checks — special HTTP endpoints (e.g., /health or /status) that services provide to check their status.
• Logging and log analysis — collecting and analyzing logs using systems like ELK Stack (Elasticsearch, Logstash, Kibana) or Graylog.
• Distributed Tracing — tracing systems such as Jaeger or Zipkin help understand the state and performance of services.
• Metrics from other monitoring systems — for example, Zabbix, Nagios, Datadog, New Relic.
• Using gRPC or REST API to obtain metrics — if services provide an API for monitoring.

Example of a simple health check in Go:

http.HandleFunc("/health", func(w http.ResponseWriter, r *http.Request) {
    w.WriteHeader(http.StatusOK)
    w.Write([]byte("OK"))
})