io.evitadb.api.observability.annotation.HistogramSettings Maven / Gradle / Ivy

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Module contains external API of the evitaDB.

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/*
 *
 *                         _ _        ____  ____
 *               _____   _(_) |_ __ _|  _ \| __ )
 *              / _ \ \ / / | __/ _` | | | |  _ \
 *             |  __/\ V /| | || (_| | |_| | |_) |
 *              \___| \_/ |_|\__\__,_|____/|____/
 *
 *   Copyright (c) 2024
 *
 *   Licensed under the Business Source License, Version 1.1 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *   https://github.com/FgForrest/evitaDB/blob/master/LICENSE
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 */

package io.evitadb.api.observability.annotation;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * Detailed settings for the histogram metric.
 *
 * @author Jan Novotný ([email protected]), FG Forrest a.s. (c) 2024
 */
@Target({ElementType.TYPE, ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
public @interface HistogramSettings {

	/**
	 * Unit of the histogram metric.
	 */
	String unit() default "milliseconds";

	/**
	 * The lowest threshold for the metric.
	 */
	int start() default 1;

	/**
	 * The multiplication factor for the next threshold (exponential by default).
	 */
	double factor() default 2.0;

	/**
	 * The number of thresholds.
	 */
	int count() default 14;

}