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Normative spec: the Jovian specification is the canonical definition of this upgrade. This page records activation data and operational pointers; it does not restate the spec.
Jovian introduced fee-market and data-availability controls for chain operators. Minimum component versions (from Upgrade 17 notice):

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What changed

Per the spec overview:
  • Execution layer: minimum base fee, DA footprint limit, and operator fee changes.
  • Consensus layer: network upgrade transactions applied during derivation; auto-upgrade and extension of the L1Block (L1 attributes) predeploy.
  • Smart contracts: SystemConfig updates.
The Upgrade 17 notice covers the operator steps that accompanied activation.