uma/packages/core/contracts/data-verification-mechanism/interfaces/OracleGovernanceInterface.sol

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity ^0.8.0;

import "./OracleInterface.sol";
import "./OracleAncillaryInterface.sol";

/**
 * @title Financial contract facing extending the Oracle interface with governance actions.
 * @dev Interface used by financial contracts to interact with the Oracle extending governance actions. Voters will use a different interface.
 */
abstract contract OracleGovernanceInterface is OracleInterface, OracleAncillaryInterface {
    /**
     * @notice Enqueues a request (if a request isn't already present) for the given `identifier`, `time` pair.
     * @dev Time must be in the past and the identifier must be supported.
     * @param identifier uniquely identifies the price requested. eg BTC/USD (encoded as bytes32) could be requested.
     * @param ancillaryData arbitrary data appended to a price request to give the voters more info from the caller.
     * @param time unix timestamp for the price request.
     */
    function requestGovernanceAction(
        bytes32 identifier,
        uint256 time,
        bytes memory ancillaryData
    ) external virtual;
}