import type { OtlpAggregationTemporality, OtlpAttribute, OtlpMetric, OtlpMetricsDocument } from "./types.js";
/**
 * Flatten an OTLP `KeyValue` attribute array into a plain string record.
 *
 * All OTLP value types (string, bool, int, double) are coerced to strings.
 * Attributes with an absent or unrecognised value are stored as empty strings.
 *
 * @param attributes - Optional OTLP attribute array to flatten.
 * @returns A `Record<string, string>` mapping each attribute key to its string value.
 */
export declare function otlpAttributesToRecord(attributes: OtlpAttribute[] | undefined): Record<string, string>;
/**
 * Parse and minimally validate an OTLP metrics JSON string.
 *
 * Validates that the top-level object contains a `resourceMetrics` array.
 * Throws if the input is not valid JSON or if `resourceMetrics` is absent/not
 * an array.
 *
 * @param input - Raw OTLP metrics JSON string.
 * @returns The parsed `OtlpMetricsDocument`.
 */
export declare function parseOtlp(input: string): OtlpMetricsDocument;
/**
 * Determine the data kind of an OTLP metric.
 *
 * Supported kinds are `"gauge"`, `"sum"`, and `"histogram"`.
 * Throws an `Error` if none of those fields are present on the metric.
 *
 * @param metric - The OTLP metric to inspect.
 * @returns `"gauge"`, `"sum"`, or `"histogram"`.
 */
export declare function getOtlpMetricKind(metric: OtlpMetric): "gauge" | "sum" | "histogram";
/**
 * Resolve the aggregation temporality for an OTLP sum or histogram metric.
 *
 * Maps the raw numeric OTLP enum to a human-readable string:
 * - `1` → `"delta"`
 * - `2` → `"cumulative"`
 * - anything else (including absent) → `"unspecified"`
 *
 * @param metric - The OTLP metric to inspect.
 * @returns The `OtlpAggregationTemporality` string value.
 */
export declare function getOtlpTemporality(metric: OtlpMetric): OtlpAggregationTemporality;
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