I would like to create an alert in Prometheus for a REST API, if the API is not available 99% of the time. I am new to prometheus expression. Could you please help me to create an expression to trigger this ALERT. For example if i have a counter failed_counter that tracks the http failures. Please help.
prometheus alert expression for 99% availability of rest API
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implementing-slos-using-prometheus
You can use the following tool for that: SLO generator.
promtools SLOs
This website could be helpful as well:
awesome-prometheus-alerts
blackbox_exporter