DeckFileFormat returns Deck file format based on Kong version.

ConsumerGroupsVersionCutoff is the Kong version prior to the addition of Consumer Groups as first class citizens.

ExplicitRegexPathVersionCutoff is the lowest Kong version requiring the explicit "~" prefixes in regular expression paths.

ExpressionRouterL4Cutoff is the lowest Kong version with support of L4 proxy in expression router.

FlattenedErrorCutoff is the lowest Kong version with support for flattened errors.

MTLSCredentialVersionCutoff is the minimum Kong version that support mTLS credentials.

PluginInstanceNameCutoff is the lowest Kong version having the `instance_name` field in `plugin` objects.

PluginOrderingVersionCutoff is the Kong version prior to the addition of plugin ordering.

RegexHeaderVersionCutoff is the Kong version prior to the addition of support for regular expression for matching headers.

TLSPassthroughCutoff is the lowest Kong version with support for TLS passthrough.