com.netflix.spectator.atlas.AtlasConfig Maven / Gradle / Ivy
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/*
* Copyright 2014-2021 Netflix, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* 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 com.netflix.spectator.atlas;
import com.netflix.spectator.api.Clock;
import com.netflix.spectator.api.Registry;
import com.netflix.spectator.api.RegistryConfig;
import java.time.Duration;
import java.util.Collections;
import java.util.Map;
/**
* Configuration for Atlas registry.
*/
public interface AtlasConfig extends RegistryConfig {
/**
* Returns the step size (reporting frequency) to use. The default is 1 minute.
*/
default Duration step() {
String v = get("atlas.step");
return (v == null) ? Duration.ofMinutes(1) : Duration.parse(v);
}
/**
* Returns the TTL for meters that do not have any activity. After this period the meter
* will be considered expired and will not get reported. Default is 15 minutes.
*/
default Duration meterTTL() {
String v = get("atlas.meterTTL");
return (v == null) ? Duration.ofMinutes(15) : Duration.parse(v);
}
/**
* Returns true if publishing to Atlas is enabled. Default is true.
*/
default boolean enabled() {
String v = get("atlas.enabled");
return v == null || Boolean.parseBoolean(v);
}
/**
* Returns true if the registry should automatically start the background reporting threads
* in the constructor. When using DI systems this can be used to automatically start the
* registry when it is constructed. Otherwise the {@code AtlasRegistry.start()} method will
* need to be called explicitly. Default is false.
*/
default boolean autoStart() {
String v = get("atlas.autoStart");
return v != null && Boolean.parseBoolean(v);
}
/**
* Returns the number of threads to use with the scheduler. The default is
* 4 threads.
*/
default int numThreads() {
String v = get("atlas.numThreads");
return (v == null) ? 4 : Integer.parseInt(v);
}
/**
* Returns the URI for the Atlas backend. The default is
* {@code http://localhost:7101/api/v1/publish}.
*/
default String uri() {
String v = get("atlas.uri");
return (v == null) ? "http://localhost:7101/api/v1/publish" : v;
}
/**
* Returns the step size (reporting frequency) to use for streaming to Atlas LWC.
* The default is 5s. This is the highest resolution that would be supported for getting
* an on-demand stream of the data. It must be less than or equal to the Atlas step
* ({@link #step()}) and the Atlas step should be an even multiple of this value.
*/
default Duration lwcStep() {
String v = get("atlas.lwc.step");
return (v == null) ? Duration.ofSeconds(5) : Duration.parse(v);
}
/**
* Returns true if streaming to Atlas LWC is enabled. Default is false.
*/
default boolean lwcEnabled() {
String v = get("atlas.lwc.enabled");
return v != null && Boolean.parseBoolean(v);
}
/**
* Returns true if expressions with the same step size as Atlas publishing should be
* ignored for streaming. This is used for cases where data being published to Atlas
* is also sent into streaming from the backend. Default is true.
*/
default boolean lwcIgnorePublishStep() {
String v = get("atlas.lwc.ignore-publish-step");
return v == null || Boolean.parseBoolean(v);
}
/** Returns the frequency for refreshing config settings from the LWC service. */
default Duration configRefreshFrequency() {
String v = get("atlas.configRefreshFrequency");
return (v == null) ? Duration.ofSeconds(10) : Duration.parse(v);
}
/** Returns the TTL for subscriptions from the LWC service. */
default Duration configTTL() {
return configRefreshFrequency().multipliedBy(15);
}
/**
* Returns the URI for the Atlas LWC endpoint to retrieve current subscriptions.
* The default is {@code http://localhost:7101/lwc/api/v1/expressions/local-dev}.
*/
default String configUri() {
String v = get("atlas.config-uri");
return (v == null) ? "http://localhost:7101/lwc/api/v1/expressions/local-dev" : v;
}
/**
* Returns the URI for the Atlas LWC endpoint to evaluate the data for a suscription.
* The default is {@code http://localhost:7101/lwc/api/v1/evaluate}.
*/
default String evalUri() {
String v = get("atlas.eval-uri");
return (v == null) ? "http://localhost:7101/lwc/api/v1/evaluate" : v;
}
/**
* Returns the connection timeout for requests to the backend. The default is
* 1 second.
*/
default Duration connectTimeout() {
String v = get("atlas.connectTimeout");
return (v == null) ? Duration.ofSeconds(1) : Duration.parse(v);
}
/**
* Returns the read timeout for requests to the backend. The default is
* 10 seconds.
*/
default Duration readTimeout() {
String v = get("atlas.readTimeout");
return (v == null) ? Duration.ofSeconds(10) : Duration.parse(v);
}
/**
* Returns the number of measurements per request to use for the backend. If more
* measurements are found, then multiple requests will be made. The default is
* 10,000.
*/
default int batchSize() {
String v = get("atlas.batchSize");
return (v == null) ? 10000 : Integer.parseInt(v);
}
/**
* Returns the common tags to apply to all metrics reported to Atlas. The returned tags
* must only use valid characters as defined by {@link #validTagCharacters()}. The default
* is an empty map.
*/
default Map commonTags() {
return Collections.emptyMap();
}
/**
* Returns a pattern indicating the valid characters for a tag key or value. The default is
* {@code -._A-Za-z0-9~^}.
*/
default String validTagCharacters() {
return "-._A-Za-z0-9~^";
}
/**
* Returns a map from tag key to a pattern indicating the valid characters for the values
* of that key. The default is an empty map.
*
* @deprecated This method is no longer used internally.
*/
@Deprecated
default Map validTagValueCharacters() {
return Collections.emptyMap();
}
/**
* Returns a registry to use for recording metrics about the behavior of the AtlasRegistry.
* By default it will return null and the metrics will be reported to itself. In some cases
* it is useful to customize this for debugging so that the metrics for the behavior of
* AtlasRegistry will have a different failure mode than AtlasRegistry.
*/
default Registry debugRegistry() {
return null;
}
/**
* Returns a rollup policy that will be applied to the measurements before sending to Atlas.
* The policy will not be applied to data going to the streaming path. Default is a no-op
* policy.
*/
default RollupPolicy rollupPolicy() {
return RollupPolicy.noop(commonTags());
}
/**
* Avoid collecting right on boundaries to minimize transitions on step longs
* during a collection. By default it will randomly distribute across the middle
* of the step interval.
*/
default long initialPollingDelay(Clock clock, long stepSize) {
long now = clock.wallTime();
long stepBoundary = now / stepSize * stepSize;
// Buffer by 10% of the step interval on either side
long offset = stepSize / 10;
// For larger intervals spread it out, otherwise bias towards the start
// to ensure there is plenty of time to send without needing to cross over
// to the next interval. The threshold of 1s was chosen because it is typically
// big enough to avoid GC troubles where it is common to see pause times in the
// low 100s of milliseconds.
if (offset >= 1000L) {
// Check if the current delay is within the acceptable range
long delay = now - stepBoundary;
if (delay < offset) {
return delay + offset;
} else {
return Math.min(delay, stepSize - offset);
}
} else {
long firstTime = stepBoundary + stepSize / 10;
return firstTime > now
? firstTime - now
: firstTime + stepSize - now;
}
}
/**
* Alpha: this method is experimental and may change or be completely
* removed with no notice.
*
* Override to provide a custom publisher for sending data to Atlas. The intended use is
* for some cases where it is desirable to send the payload somewhere else or to use an
* alternate client. If the return value is null, then the data will be sent via the normal
* path.
*/
default Publisher publisher() {
return null;
}
}
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