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@ -207,6 +207,12 @@ This should **only** be applied to metrics that currently produce such labels.
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regex: (\d+)\.0+;.*_bucket
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regex: (\d+)\.0+;.*_bucket
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```
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```
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### Disallow configuring Alertmanager with the v1 API
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Prometheus 3 no longer supports Alertmanager's v1 API. Effectively Prometheus 3
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requires [Alertmanager 0.16.0](https://github.com/prometheus/alertmanager/releases/tag/v0.16.0) or later. Users with older Alertmanager
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versions or configurations that use `alerting: alertmanagers: [api_version: v1]`
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need to upgrade Alertmanager and change their configuration to use `api_version: v2`.
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# Prometheus 2.0 migration guide
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# Prometheus 2.0 migration guide
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For the Prometheus 1.8 to 2.0 please refer to the [Prometheus v2.55 documentation](https://prometheus.io/docs/prometheus/2.55/migration/).
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For the Prometheus 1.8 to 2.0 please refer to the [Prometheus v2.55 documentation](https://prometheus.io/docs/prometheus/2.55/migration/).
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