import type { MetadataBearer as __MetadataBearer } from "@smithy/types";
import type { DiscoverInstancesRequest, DiscoverInstancesResponse } from "../models/models_0";
/**
 * @public
 */
export type { __MetadataBearer };
/**
 * @public
 *
 * The input for {@link DiscoverInstancesCommand}.
 */
export interface DiscoverInstancesCommandInput extends DiscoverInstancesRequest {
}
/**
 * @public
 *
 * The output of {@link DiscoverInstancesCommand}.
 */
export interface DiscoverInstancesCommandOutput extends DiscoverInstancesResponse, __MetadataBearer {
}
declare const DiscoverInstancesCommand_base: {
    new (input: DiscoverInstancesCommandInput): import("@smithy/core/client").CommandImpl<DiscoverInstancesCommandInput, DiscoverInstancesCommandOutput, import("..").ServiceDiscoveryClientResolvedConfig, import("..").ServiceInputTypes, import("..").ServiceOutputTypes>;
    new (input: DiscoverInstancesCommandInput): import("@smithy/core/client").CommandImpl<DiscoverInstancesCommandInput, DiscoverInstancesCommandOutput, import("..").ServiceDiscoveryClientResolvedConfig, import("..").ServiceInputTypes, import("..").ServiceOutputTypes>;
    getEndpointParameterInstructions(): import("@smithy/types").EndpointParameterInstructions;
};
/**
 * <p>Discovers registered instances for a specified namespace and service. You can use
 *     <code>DiscoverInstances</code> to discover instances for any type of namespace.
 *     <code>DiscoverInstances</code> returns a randomized list of instances allowing customers to
 *    distribute traffic evenly across instances. For public and private DNS namespaces, you can also
 *    use DNS queries to discover instances.</p>
 * @example
 * Use a bare-bones client and the command you need to make an API call.
 * ```javascript
 * import { ServiceDiscoveryClient, DiscoverInstancesCommand } from "@aws-sdk/client-servicediscovery"; // ES Modules import
 * // const { ServiceDiscoveryClient, DiscoverInstancesCommand } = require("@aws-sdk/client-servicediscovery"); // CommonJS import
 * // import type { ServiceDiscoveryClientConfig } from "@aws-sdk/client-servicediscovery";
 * const config = {}; // type is ServiceDiscoveryClientConfig
 * const client = new ServiceDiscoveryClient(config);
 * const input = { // DiscoverInstancesRequest
 *   NamespaceName: "STRING_VALUE", // required
 *   ServiceName: "STRING_VALUE", // required
 *   MaxResults: Number("int"),
 *   QueryParameters: { // Attributes
 *     "<keys>": "STRING_VALUE",
 *   },
 *   OptionalParameters: {
 *     "<keys>": "STRING_VALUE",
 *   },
 *   HealthStatus: "HEALTHY" || "UNHEALTHY" || "ALL" || "HEALTHY_OR_ELSE_ALL",
 *   OwnerAccount: "STRING_VALUE",
 * };
 * const command = new DiscoverInstancesCommand(input);
 * const response = await client.send(command);
 * // { // DiscoverInstancesResponse
 * //   Instances: [ // HttpInstanceSummaryList
 * //     { // HttpInstanceSummary
 * //       InstanceId: "STRING_VALUE",
 * //       NamespaceName: "STRING_VALUE",
 * //       ServiceName: "STRING_VALUE",
 * //       HealthStatus: "HEALTHY" || "UNHEALTHY" || "UNKNOWN",
 * //       Attributes: { // Attributes
 * //         "<keys>": "STRING_VALUE",
 * //       },
 * //     },
 * //   ],
 * //   InstancesRevision: Number("long"),
 * // };
 *
 * ```
 *
 * @param DiscoverInstancesCommandInput - {@link DiscoverInstancesCommandInput}
 * @returns {@link DiscoverInstancesCommandOutput}
 * @see {@link DiscoverInstancesCommandInput} for command's `input` shape.
 * @see {@link DiscoverInstancesCommandOutput} for command's `response` shape.
 * @see {@link ServiceDiscoveryClientResolvedConfig | config} for ServiceDiscoveryClient's `config` shape.
 *
 * @throws {@link InvalidInput} (client fault)
 *  <p>One or more specified values aren't valid. For example, a required value might be missing, a
 *    numeric value might be outside the allowed range, or a string value might exceed length
 *    constraints.</p>
 *
 * @throws {@link NamespaceNotFound} (client fault)
 *  <p>No namespace exists with the specified ID.</p>
 *
 * @throws {@link RequestLimitExceeded} (client fault)
 *  <p>The operation can't be completed because you've reached the quota for the number of
 *    requests. For more information, see <a href="https://docs.aws.amazon.com/cloud-map/latest/dg/throttling.html">Cloud Map API request throttling quota</a> in the
 *     <i>Cloud Map Developer Guide</i>.</p>
 *
 * @throws {@link ServiceNotFound} (client fault)
 *  <p>No service exists with the specified ID.</p>
 *
 * @throws {@link ServiceDiscoveryServiceException}
 * <p>Base exception class for all service exceptions from ServiceDiscovery service.</p>
 *
 *
 * @example Discover instances using owner account
 * ```javascript
 * // Discovers instances in a shared namespace by specifying the OwnerAccount parameter, useful when working with shared namespaces.
 * const input = {
 *   NamespaceName: "example-shared-namespace",
 *   OwnerAccount: "123456789012",
 *   ServiceName: "shared-namespace-service"
 * };
 * const command = new DiscoverInstancesCommand(input);
 * const response = await client.send(command);
 * /* response is
 * {
 *   Instances: [
 *     {
 *       Attributes: {
 *         AWS_INSTANCE_IPV4: "192.0.2.44",
 *         AWS_INSTANCE_PORT: "80"
 *       },
 *       HealthStatus: "HEALTHY",
 *       InstanceId: "i-abcd1234xmpl5678",
 *       NamespaceName: "example-shared-namespace",
 *       ServiceName: "shared-service"
 *     },
 *     {
 *       Attributes: {
 *         AWS_INSTANCE_IPV4: "192.0.2.45",
 *         AWS_INSTANCE_PORT: "80"
 *       },
 *       HealthStatus: "HEALTHY",
 *       InstanceId: "i-efgh5678xmpl9012",
 *       NamespaceName: "example-shared-namespace",
 *       ServiceName: "shared-service"
 *     }
 *   ]
 * }
 * *\/
 * ```
 *
 * @example Example: Discover registered instances
 * ```javascript
 * // Example: Discover registered instances
 * const input = {
 *   HealthStatus: "ALL",
 *   MaxResults: 10,
 *   NamespaceName: "example.com",
 *   ServiceName: "myservice"
 * };
 * const command = new DiscoverInstancesCommand(input);
 * const response = await client.send(command);
 * /* response is
 * {
 *   Instances: [
 *     {
 *       Attributes: {
 *         AWS_INSTANCE_IPV4: "172.2.1.3",
 *         AWS_INSTANCE_PORT: "808"
 *       },
 *       HealthStatus: "UNKNOWN",
 *       InstanceId: "myservice-53",
 *       NamespaceName: "example.com",
 *       ServiceName: "myservice"
 *     }
 *   ]
 * }
 * *\/
 * ```
 *
 * @public
 */
export declare class DiscoverInstancesCommand extends DiscoverInstancesCommand_base {
    /** @internal type navigation helper, not in runtime. */
    protected static __types: {
        api: {
            input: DiscoverInstancesRequest;
            output: DiscoverInstancesResponse;
        };
        sdk: {
            input: DiscoverInstancesCommandInput;
            output: DiscoverInstancesCommandOutput;
        };
    };
}