Join PromCon EU 2026 , the Prometheus ... Oct 7–8, Munich. ... Alerting rules allow you to define alert conditions based on Prometheus expression language expressions and to send notifications about firing alerts to an external service....

Alert thresholds depend on the nature of your applications. Some queries may have arbitrary tolerance thresholds. Building an efficient monitoring platform takes time.

Each file in rules/ targets a specific system or service. All alert names use CamelCase and include severity labels (page, warning, info).

January 30, 2026 - This guide walks through the principles, patterns, and practical examples you need to build alert rules that actually work. ... Prometheus evaluates alert rules at regular intervals.

June 2, 2025 - The for duration specifies how long a condition must be true before firing an alert, while the evaluation interval determines how often Prometheus checks the condition. An alert with for: 5m needs the condition to be true for five consecutive ...

The alerting rules should be wide-ranging, starting from testing the reachability of your Prometheus and Alertmanager servers by checking the up metric's value and its presence, and then checking whether the scraping, TSDB sample ingestion, and rule evaluation works fine, whether alerts are sent out to the Alertmanager without errors or delays, and so on.

When the operator generates the Alertmanager configuration from it, the namespace label will not be enforced for routes and inhibition rules. The PrometheusRule CRD allows to define alerting and recording rules.

The rule queries are applied on Prometheus metrics stored in an Azure Monitor workspace. Whenever the alert query results in one or more time series meeting the condition, the alert counts as pending for these metric and label sets.

December 5, 2025 - # prometheus.yml global: scrape_interval: 15s evaluation_interval: 15s rule_files: - '/etc/prometheus/rules/*.yml' - '/etc/prometheus/alerts/*.yml' alerting: alertmanagers: - static_configs: - targets: - 'alertmanager:9093'

April 17, 2023 - Use alert templates to reduce the amount of duplication in your alert rules, as duplication increases management complexity. Automate alert handling where possible to reduce the time required to respond to alerts and to minimize human error. You can also use your Prometheus metrics and alerts for productive incident retrospectives or build runbooks to handle similar issues.

May 19, 2022 - Since, all we need to do is check our metric that tracks how many responses with HTTP status code 500 there were, a simple alerting rule could like this: - alert: Serving HTTP 500 errors expr: http_requests_total{status=”500”} > 0 · This will alert us if we have any 500 errors served to our customers. Prometheus will run our query looking for a time series named http_requests_total that also has a status label with value “500”. Then it will filter all those matched time series and only return ones with value greater than zero.

October 21, 2018 - Prometheus alerting rules are PromQL-based conditions evaluated by the Prometheus server. When a condition is true for a specified duration, an alert fires and is routed by AlertManager to receivers like Slack, PagerDuty, or email.

Redirecting to /awesome-prometheus-alerts/rules/…

Rules within a group are run sequentially at a regular interval, with the same evaluation time. The names of recording rules must be valid metric names. The names of alerting rules must be valid label values. ... groups: - name: example rules: - record: code:prometheus_http_requests_total:sum expr: sum by (code) (prometheus_http_requests_total)

June 26, 2026 - Use alert templates to reduce the amount of duplication in your alert rules, as duplication increases management complexity. Automate alert handling where possible to reduce the time required to respond to alerts and to minimize human error. You can also use your Prometheus metrics and alerts for productive incident retrospectives or build runbooks to handle similar issues.

March 29, 2026 - # tests/alert_tests.yaml rule_files: ... is 10.0%" ... promtool ships with Prometheus and validates that your rules fire when they should and don't fire when they shouldn't....

2 weeks ago - A PrometheusRule is a Custom Resource Definition (CRD) in Prometheus Operator used to manage alerts. A PrometheusRule defines a group of Prometheus alerting rules or recording rules.

March 10, 2026 - Set up Prometheus alert rules using static thresholds or custom PromQL expressions. Configure notification policies via DingTalk, WeCom, or webhook to route alert events by severity.

August 1, 2024 - Create a file named alert.rules.yml with your alerting rules. Add the rules file to your Prometheus configuration:

- name: alert_rules rules: - alert: InstanceDown expr: up == 0 for: 1m labels: severity: critical annotations: summary: 'Instance {{ $labels.instance }} down' description: '{{ $labels.instance }} of job {{ $labels.job }} has been down for more than 1 minute.' ... If everything is ok, then restart Prometheus.