/**
 * Native (Node) metrics encoding logic for IoT SDK metrics.
 *
 * @internal
 * @packageDocumentation
 */
import * as mqtt_shared from "../common/mqtt_shared";
import * as common_mqtt5 from "../common/mqtt5";
import type { Mqtt5ClientConfig } from "./mqtt5";
import type { MqttConnectionConfig } from "./mqtt";
import { TlsCipherPreference, CertificateSource } from "./io";
import { TlsVersion } from "../common/io";
import { HttpProxyOptions } from "./http";
export { IOT_SDK_METRICS_FEATURE_VERSION, MetricsFeatureId, retry_jitter_metrics_value, session_behavior_metrics_value, outbound_topic_alias_metrics_value, inbound_topic_alias_metrics_value, protocol_version_metrics_value, merge_feature_lists, create_metrics, _setSdkMetricsFactory, _buildSdkMetrics, } from "../common/aws_iot_metrics";
export type { SdkMetricsFactory } from "../common/aws_iot_metrics";
/**
 * Map ClientOperationQueueBehavior to its single-character metrics value.
 *
 * Mapping: FailNonQos1PublishOnDisconnect->A, FailQos0PublishOnDisconnect->B,
 * FailAllOnDisconnect->C.
 * Returns undefined for the default behavior or any unrecognized value.
 * @internal
 */
export declare function offline_queue_behavior_metrics_value(behavior?: common_mqtt5.ClientOperationQueueBehavior): string | undefined;
/**
 * Detect the socket implementation and return its single-character metrics value.
 *
 * Mapping: Windows (IOCP)->B, all other platforms (POSIX)->A.
 * @internal
 */
export declare function socket_implementation_metrics_value(): string;
/**
 * Map proxy options to the single-character metrics value for proxy type.
 *
 * Mapping: HTTPS (has tls_opts)->B, HTTP->A.
 * @internal
 */
export declare function http_proxy_type_metrics_value(proxyOptions: HttpProxyOptions): string;
/**
 * Map CertificateSource to its single-character metrics value.
 *
 * Mapping: CERTIFICATE_FILES->A, PKCS11->B, WINDOWS_CERT_STORE->C, PKCS12_FILE->E.
 * Letter "D" is reserved for Java KeyStore.
 * Returns undefined for unset or unrecognized values.
 * @internal
 */
export declare function certificate_source_metrics_value(source?: CertificateSource): string | undefined;
/**
 * Map TlsCipherPreference to its single-character metrics value.
 *
 * Mapping: PQ_TLSv1_0_2021_05->F, PQ_Default->H, TLSv1_2_2025_07->I.
 * Letters A-E, G, J, K are reserved for cipher preferences exposed by
 * other language SDKs but not by Node.js.
 * Returns undefined for the default or any unrecognized value.
 * @internal
 */
export declare function tls_cipher_preference_metrics_value(pref?: TlsCipherPreference): string | undefined;
/**
 * Map TlsVersion to its single-character metrics value.
 *
 * Mapping: SSLv3->A, TLSv1->B, TLSv1_1->C, TLSv1_2->D, TLSv1_3->E.
 * Returns undefined for TlsVersion.Default so the feature is omitted
 * when no minimum was configured.
 * @internal
 */
export declare function minimum_tls_version_metrics_value(version?: TlsVersion): string | undefined;
/**
 * Generates the encoded feature list string for metrics from a native
 * MQTT5 client config.
 *
 * Format: "ID/Value,ID/Value,..."
 * Example: "A/B,C/A,F/5,G/A" means retryJitterMode=Full,
 * offlineQueueBehavior=FailNonQos1PublishOnDisconnect, protocol=MQTT5, socket=POSIX.
 *
 * MQTT5 connections always include:
 *  - F (protocolVersion): set to Mqtt5
 *  - G (socketImplementation): detected from platform (POSIX or IOCP)
 *
 * Conditionally includes (only when the option is explicitly set and not default):
 *  - A (retryJitterMode)
 *  - B (sessionBehavior)
 *  - C (offlineQueueBehavior)
 *  - D (outboundTopicAliasBehavior)
 *  - E (inboundTopicAliasBehavior)
 *  - H (httpProxyType)
 *  - I (certificate_source)
 *  - J (tls_cipher_preference)
 *  - K (min_tls_version)
 *
 * @param config - MQTT5 client configuration.
 * @returns The encoded feature list string.
 * @internal
 */
export declare function get_encoded_feature_list_mqtt5(config: Mqtt5ClientConfig): string;
/**
 * Generates the encoded feature list string for metrics from a native
 * MQTT3 connection config.
 *
 * Format: "ID/Value,ID/Value..."
 *
 * MQTT3 connections always include:
 *  - F (protocolVersion): set to Mqtt311
 *  - G (socketImplementation): detected from platform (POSIX or IOCP)
 *
 * Conditionally includes:
 *  - H (httpProxyType)
 *  - I (certificate_source)
 *  - J (tls_cipher_preference)
 *  - K (min_tls_version)
 *
 * @param config - MQTT connection config.
 * @returns The encoded feature list string.
 * @internal
 */
export declare function get_encoded_feature_list_mqtt3(config: MqttConnectionConfig): string;
/**
 * Create the final AWSIoTMetrics object for an MQTT5 client on native.
 *
 * Generates the CRT feature list from the full set of MQTT5 client config,
 * including detected certificate source from the TLS context, then delegates
 * to the shared create_metrics for merging with user-supplied SDK metrics.
 *
 * @param config - MQTT5 client configuration containing all connection
 *   configuration and optional user (AWSIoTMetrics) metrics.
 * @returns The final metrics object with merged CRT and SDK features.
 * @internal
 */
export declare function create_metrics_mqtt5(config: Mqtt5ClientConfig): mqtt_shared.AWSIoTMetrics;
/**
 * Create the final AWSIoTMetrics object for an MQTT3 connection on native.
 *
 * Generates the CRT feature list from the MQTT3 connection parameters,
 * including detected certificate source from the TLS context, then delegates
 * to the shared create_metrics for merging with user-supplied SDK metrics.
 *
 * @param config - MQTT3 connection configuration containing proxy options,
 *   TLS context, and optional user (AWSIoTMetrics) metrics.
 * @returns The final metrics object with merged CRT and SDK features.
 * @internal
 */
export declare function create_metrics_mqtt3(config: MqttConnectionConfig): mqtt_shared.AWSIoTMetrics;