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Add architecture diagram for how Reloader works #815

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Dec 18, 2024
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Add architecture diagram for how Reloader works #815

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13 changes: 12 additions & 1 deletion docs/How-it-works.md
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# How Does Reloader Work?

Reloader watches for `ConfigMap` and `Secret` and detects if there are changes in data of these objects. After change detection Reloader performs rolling upgrade on relevant Pods via associated `Deployment`, `Daemonset` and `Statefulset`.
Reloader watches for `ConfigMap` and `Secret` and detects if there are changes in data of these objects. After change detection Reloader performs rolling upgrade on relevant Pods via associated `Deployment`, `Daemonset` and `Statefulset`:

```mermaid
flowchart LR
subgraph Reloader
controller("Controller watches in a loop") -- "Detects a change" --> upgrade_handler("Upgrade handler checks if the change is a valid data change by comparing the change hash")
upgrade_handler -- "Update resource" --> update_resource("Updates the resource with computed hash of change")
end
Reloader -- "Watches" --> secret_configmaps("Secrets/ConfigMaps")
Reloader -- "Updates resources with Reloader environment variable" --> resources("Deployments/DaemonSets/StatefulSets resources with Reloader annotation")
resources -- "Restart pods based on StrategyType" --> Pods
```

## How Does Change Detection Work?

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