What are some examples of alerting rules in Loki?

Can you provide some examples of alerting rules I can use in Loki?

Sure! Here are a few examples of alerting rules you can implement in Loki:

1. Alert when the error rate exceeds a certain threshold.
2. Alert if the number of logs from a specific service drops significantly.
3. Alert on high latency logs for critical services.

How do I set up an alert for high error rates?

To set up an alert for high error rates, you can define a rule in your alerting configuration like this:

alert: HighErrorRate
expr: sum(rate({app="your_app_name", level="error"}[5m])) > 0.05
for: 5m
labels:
  severity: critical
annotations:
  summary: "High error rate detected in your_app_name"

Can I customize the alert message?

Yes, you can customize the alert message by modifying the annotations section in your alert rule. You can include variables to provide more context.

What should I do if I receive a false positive alert?

If you receive a false positive alert, you can adjust the alerting thresholds or refine the query to reduce noise. It's also helpful to review the logs to understand the cause.