How did you set up alerts in monitoring?

To set up alerts in monitoring, I use systems like Prometheus and Grafana or cloud solutions (Datadog, New Relic).

Main steps:

• Identify key metrics for monitoring (CPU, memory, response time, errors).
• Configure threshold values at which alerts are triggered.
• Set alert rules considering time (for example, trigger only if the metric exceeds the threshold for 5 minutes).
• Configure notification channels: email, Slack, PagerDuty.

For example, in Prometheus, an alert rule might look like this:

alert: HighErrorRate
expr: rate(http_requests_total{status=~"5.."}[5m]) > 0.05
for: 5m
labels:
  severity: critical
annotations:
  summary: "High 5xx error rate"
  description: "Error exceeds 5% over the last 5 minutes"

It is important to balance sensitivity of alerts and the number of false positives to avoid creating "noise" and to respond promptly to real issues.