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docs: example for matchExpressions filtering #596

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docs: example for matchExpressions filtering
miguelvr Dec 2, 2024
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23 changes: 23 additions & 0 deletions docs/source/analyze/node-resources.md
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Expand Up @@ -157,6 +157,29 @@ Troubleshoot allows users to analyze nodes that match one or more labels. For ex
message: This cluster has a node with enough memory and cpu capacity running Mongo Operator.
```

> Filtering by labels with `matchExpressions` was introduced in Troubleshoot 0.113.0.

Alternatively, you can use `matchExpressions` to specify a list of selector label expressions that the node needs to match in its metadata.
```yaml
- nodeResources:
checkName: Must have Mongo running
filters:
allocatableMemory: 16Gi
cpuCapacity: "5"
selector:
matchExpressions:
- key: kubernetes.io/role
operator: In
values:
- database-primary-replica
outcomes:
- fail:
when: "count() < 1"
message: Must have 1 node with 16 GB (available) memory and 5 cores (on a single node) running Mongo Operator.
- pass:
message: This cluster has a node with enough memory and cpu capacity running Mongo Operator.
```

## Message Templating
To make the outcome message more informative, you can include certain values gathered by the NodeResources collector as templates. The templates are enclosed in double curly braces with a dot separator. The following templates are available:

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