import { Command as $Command } from "@smithy/smithy-client";
import type { MetadataBearer as __MetadataBearer } from "@smithy/types";
import type { EC2ClientResolvedConfig, ServiceInputTypes, ServiceOutputTypes } from "../EC2Client";
import type { DescribeInstanceTopologyRequest, DescribeInstanceTopologyResult } from "../models/models_4";
/**
 * @public
 */
export type { __MetadataBearer };
export { $Command };
/**
 * @public
 *
 * The input for {@link DescribeInstanceTopologyCommand}.
 */
export interface DescribeInstanceTopologyCommandInput extends DescribeInstanceTopologyRequest {
}
/**
 * @public
 *
 * The output of {@link DescribeInstanceTopologyCommand}.
 */
export interface DescribeInstanceTopologyCommandOutput extends DescribeInstanceTopologyResult, __MetadataBearer {
}
declare const DescribeInstanceTopologyCommand_base: {
    new (input: DescribeInstanceTopologyCommandInput): import("@smithy/smithy-client").CommandImpl<DescribeInstanceTopologyCommandInput, DescribeInstanceTopologyCommandOutput, EC2ClientResolvedConfig, ServiceInputTypes, ServiceOutputTypes>;
    new (...[input]: [] | [DescribeInstanceTopologyCommandInput]): import("@smithy/smithy-client").CommandImpl<DescribeInstanceTopologyCommandInput, DescribeInstanceTopologyCommandOutput, EC2ClientResolvedConfig, ServiceInputTypes, ServiceOutputTypes>;
    getEndpointParameterInstructions(): import("@smithy/middleware-endpoint").EndpointParameterInstructions;
};
/**
 * <p>Describes a tree-based hierarchy that represents the physical host placement of your
 *             EC2 instances within an Availability Zone or Local Zone. You can use this information to
 *             determine the relative proximity of your EC2 instances within the Amazon Web Services network to
 *             support your tightly coupled workloads.</p>
 *          <p>Instance topology is supported for specific instance types only. For more information,
 *             see <a href="https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-topology-prerequisites.html">Prerequisites
 *                 for Amazon EC2 instance topology</a> in the
 *             <i>Amazon EC2 User Guide</i>.</p>
 *          <note>
 *             <p>The Amazon EC2 API follows an eventual consistency model due to the
 *                 distributed nature of the system supporting it. As a result, when you call the
 *                 DescribeInstanceTopology API command immediately after launching instances, the
 *                 response might return a <code>null</code> value for <code>capacityBlockId</code>
 *                 because the data might not have fully propagated across all subsystems. For more
 *                 information, see <a href="https://docs.aws.amazon.com/ec2/latest/devguide/eventual-consistency.html">Eventual consistency in the
 *                         Amazon EC2 API</a> in the <i>Amazon EC2 Developer
 *                     Guide</i>.</p>
 *          </note>
 *          <p>For more information, see <a href="https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-topology.html">Amazon EC2 topology</a> in
 *             the <i>Amazon EC2 User Guide</i>.</p>
 * @example
 * Use a bare-bones client and the command you need to make an API call.
 * ```javascript
 * import { EC2Client, DescribeInstanceTopologyCommand } from "@aws-sdk/client-ec2"; // ES Modules import
 * // const { EC2Client, DescribeInstanceTopologyCommand } = require("@aws-sdk/client-ec2"); // CommonJS import
 * // import type { EC2ClientConfig } from "@aws-sdk/client-ec2";
 * const config = {}; // type is EC2ClientConfig
 * const client = new EC2Client(config);
 * const input = { // DescribeInstanceTopologyRequest
 *   DryRun: true || false,
 *   NextToken: "STRING_VALUE",
 *   MaxResults: Number("int"),
 *   InstanceIds: [ // DescribeInstanceTopologyInstanceIdSet
 *     "STRING_VALUE",
 *   ],
 *   GroupNames: [ // DescribeInstanceTopologyGroupNameSet
 *     "STRING_VALUE",
 *   ],
 *   Filters: [ // FilterList
 *     { // Filter
 *       Name: "STRING_VALUE",
 *       Values: [ // ValueStringList
 *         "STRING_VALUE",
 *       ],
 *     },
 *   ],
 * };
 * const command = new DescribeInstanceTopologyCommand(input);
 * const response = await client.send(command);
 * // { // DescribeInstanceTopologyResult
 * //   Instances: [ // InstanceSet
 * //     { // InstanceTopology
 * //       InstanceId: "STRING_VALUE",
 * //       InstanceType: "STRING_VALUE",
 * //       GroupName: "STRING_VALUE",
 * //       NetworkNodes: [ // NetworkNodesList
 * //         "STRING_VALUE",
 * //       ],
 * //       AvailabilityZone: "STRING_VALUE",
 * //       ZoneId: "STRING_VALUE",
 * //       CapacityBlockId: "STRING_VALUE",
 * //     },
 * //   ],
 * //   NextToken: "STRING_VALUE",
 * // };
 *
 * ```
 *
 * @param DescribeInstanceTopologyCommandInput - {@link DescribeInstanceTopologyCommandInput}
 * @returns {@link DescribeInstanceTopologyCommandOutput}
 * @see {@link DescribeInstanceTopologyCommandInput} for command's `input` shape.
 * @see {@link DescribeInstanceTopologyCommandOutput} for command's `response` shape.
 * @see {@link EC2ClientResolvedConfig | config} for EC2Client's `config` shape.
 *
 * @throws {@link EC2ServiceException}
 * <p>Base exception class for all service exceptions from EC2 service.</p>
 *
 *
 * @public
 */
export declare class DescribeInstanceTopologyCommand extends DescribeInstanceTopologyCommand_base {
    /** @internal type navigation helper, not in runtime. */
    protected static __types: {
        api: {
            input: DescribeInstanceTopologyRequest;
            output: DescribeInstanceTopologyResult;
        };
        sdk: {
            input: DescribeInstanceTopologyCommandInput;
            output: DescribeInstanceTopologyCommandOutput;
        };
    };
}