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sinapah
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Apr 16, 2026
YanisaHS
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Apr 16, 2026
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| # What is COS? | ||
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| The **Canonical Observability Stack** (COS) is a highly-integrated, low-operations observability suite powered by [Juju](https://documentation.ubuntu.com/juju/3.6/) and Kubernetes. |
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| The **Canonical Observability Stack** (COS) is a highly-integrated, low-operations observability suite powered by [Juju](https://documentation.ubuntu.com/juju/3.6/) and Kubernetes. | |
| The Canonical Observability Stack (COS) is a highly-integrated, low-operations observability suite powered by [Juju](https://documentation.ubuntu.com/juju/3.6/) and Kubernetes. There are two editions available: COS and COS Lite. |
This should be clarified somewhere in the intro section. I like here/upfront better, but it could also be as a new line at the bottom.
The reason I'm suggesting this is because "COS" can be used to be either COS or "COS and COS Lite" (i.e., the entire product/offering), so it's good to set that clarification early - basically implying that "COS" can refer to both editions
(I made a similar call-out in a What is Landscape? doc)
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| The **Canonical Observability Stack** (COS) is a highly-integrated, low-operations observability suite powered by [Juju](https://documentation.ubuntu.com/juju/3.6/) and Kubernetes. | |
| The Canonical Observability Stack (COS) is a highly-integrated, low-operations observability suite powered by [Juju](https://documentation.ubuntu.com/juju/3.6/) and Kubernetes. There are two editions available: COS HA (more commonly referred to as COS) and COS Lite. |
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COS (sometimes referred to as COS HA)
| - Alert rules are evaluated by Prometheus and Loki, and notifications are routed through **Alertmanager**. | ||
| - All telemetry is visualised through **Grafana**, which is pre-configured to query each backend as a datasource. | ||
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| Juju topology labels are automatically applied to all telemetry, making it possible to filter and correlate data by model, application, unit, or charm. |
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Link to the Juju telemetry labels page in the COS docs
YanisaHS
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LGTM, but pointing out Leon's suggestion to call them "variants" rather than "editions"
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Issue
stack variantsdoc since most of its info was repeated in theCOS Componentsdoc anyway. Move the necessary information to theWhat is COSdoc.Solution
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Testing Instructions
Upgrade Notes