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docs: SD implementations do not have to only send new/changed target groups (#3713)

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Callum Styan 2018-01-26 14:03:11 -08:00 committed by Brian Brazil
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discovery/README.md
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@ -140,7 +140,9 @@ type Discoverer interface {
}
```
Prometheus will call the `Run()` method on a provider to initialise the discovery mechanism. The mechanism will then send *all* the `TargetGroup`s into the channel. Now the mechanism will watch for changes and then send only changed and new `TargetGroup`s down the channel.
Prometheus will call the `Run()` method on a provider to initialise the discovery mechanism. The mechanism will then send *all* the `TargetGroup`s into the channel.
Now the mechanism will watch for changes. For each update it can send all `TargetGroup`s, or only changed and new `TargetGroup`s, down the channel. `Manager` will handle
both cases.
For example if we had a discovery mechanism and it retrieves the following groups: