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Posts tagged “observability”
Every post filed under “observability”, newest first.
7posts.
OpsCanopy12 min read
Why isn't my alert reaching the right receiver?
Alerts going to the wrong receiver, or none at all? Debug Alertmanager routing — first-match-wins, missing continue, matcher regex and catch-all defaults.
- alertmanager
- observability
- alerting
OpsCanopy10 min read
Alertmanager matchers, grouping and route inheritance
Alertmanager route config reference: the matchers, match and match_re forms, anchored regexes, the four grouping fields, and what a child route inherits.
- alertmanager
- observability
- alerting
OpsCanopy9 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
OpsCanopy10 min read
Prometheus Relabel Actions: keep, labelmap, hashmod
A field reference for all 11 Prometheus relabel actions — replace, keep, drop, labelmap, labeldrop, hashmod, keepequal, lowercase — each with an example.
- prometheus
- observability
- relabeling
OpsCanopy5 min read
How to read a PromQL query
A PromQL query reads inside out, not left to right. The four layers — selectors, ranges, functions and aggregations — so you can decode any expression fast.
- promql
- prometheus
- observability
OpsCanopy5 min read
LogQL vs PromQL: the same query in both languages
LogQL borrows PromQL’s shape but starts from log lines, not metrics. How the two query languages line up, where they translate cleanly, and where they don’t.
- logql
- promql
- observability
OpsCanopy5 min read
Unit Testing Loki Alert Rules: the gap promtool leaves
Prometheus has promtool test rules. Loki has nothing equivalent. Why testing LogQL alert rules matters, what a Loki rule unit test looks like, and how to do it.
- loki
- observability
- testing