The method `ApplicationManifestUtilsV3#write` uses a static snakeyaml `Yaml` dumper to write all manifests into a byte array. This operation is inheritly not threadsafe, as the deserializer is not. This in itself may not a be problem. However, when using `Applications#pushManifestv3` to push multiple Apps in parallel this can cause issues that manifest in the form of - `Bad request: Manifest does not support Anchors and Aliases` or - `java.lang.NullPointerException: Nodes must be provided.` [Snakeyaml recommends to create a singe instance per thread.](https://github.com/snakeyaml/snakeyaml/blob/4f5f973c4a27ab3fa0c42dd0eb491bca06bb3df7/src/main/java/org/yaml/snakeyaml/Yaml.java#L47)