Tag
Posts tagged “observability”
Every post filed under “observability”, newest first.
7 posts.
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OpsCanopy 12 min read
Why Isnt My Alert Reaching the Right Receiver? Debugging Alertmanager Routing
Alerts going to the wrong receiver, or no receiver at all? Debug Alertmanager routing — first-match-wins, missing continue, matcher regex and catch-all defaults.
- alertmanager
- observability
- alerting
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OpsCanopy 10 min read
How Alertmanager Routing Works: Matchers, continue, and the Route Tree
A clear mental model for Alertmanager routing — the route tree, matchers, the continue flag, grouping and receiver inheritance — so you know exactly where an alert goes.
- alertmanager
- observability
- alerting
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OpsCanopy 9 min read
Why Did Prometheus Drop My Target? Debugging relabel_configs
A target vanished or a label disappeared after relabeling. Debug Prometheus relabel_configs vs metric_relabel_configs, regex anchoring and keep/drop logic.
- prometheus
- observability
- relabeling
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OpsCanopy 10 min read
Prometheus relabel_configs Explained: A Practical Guide
Understand Prometheus relabel_configs end to end — source_labels, regex, replacement and every action (replace, keep, drop, labelmap, hashmod) — with copy-paste recipes.
- prometheus
- observability
- relabeling
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OpsCanopy 5 min read
How to read a PromQL query
A PromQL query is read from the inside out, not left to right. Learn the four layers — selectors, ranges, functions and aggregations — so you can decode any Prometheus expression at a glance.
- promql
- prometheus
- observability
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OpsCanopy 5 min read
LogQL vs PromQL: the same query in both languages
LogQL borrows PromQL’s shape but starts from log lines, not metrics. Here is how the two query languages line up, where they translate cleanly, and where they simply don’t.
- logql
- promql
- observability
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OpsCanopy 5 min read
Unit Testing Loki Alert Rules: the gap promtool leaves
Prometheus has promtool test rules. Loki has nothing equivalent. Here is why testing LogQL alert rules matters, what a Loki rule unit test should look like, and how to close the gap today.
- loki
- observability
- testing