Module io.helidon.metrics.api

Package io.helidon.metrics.api

package io.helidon.metrics.api

Defines the Helidon metrics API so Helidon metrics-capable components can implement metrics simply and without regard for whether metrics is actually on the runtime path or not or is enabled or not.

The registry factories created and used at runtime are managed by a RegistryFactoryProvider. This module provides one implementation (NoOpRegistryFactory which returns RegistryFactory instances which create no-op metrics. If the regular metrics implementation component is on the path at runtime, then the RegistryFactoryProvider furnished by that component will create fully functional registry factories.

Related Packages

Package	Description
io.helidon.metrics.api.spi	SPI for the metrics API.

Class	Description
AbstractMetric	Common reusable implementation for any category of metric implementation (full-featured, no-op).
AbstractRegistry	Common behavior for any category (e.g., full-featured or no-op) metrics registry.
AbstractRegistry.GaugeFactory	Gauge factories based on either functions or suppliers.
AbstractRegistry.GaugeFactory.FunctionBased	Gauge factory based on a function which provides the gauge value when passed an object of a declared type.
AbstractRegistry.GaugeFactory.SupplierBased	Gauge factory based on a supplier which provides the gauge value.
BaseMetricsSettings	Settings which control base metrics.
BaseMetricsSettings.Builder	Builder for BaseMetricsSettings.
ComponentMetricsSettings	Settings which control metrics behavior for a metrics-capable component.
ComponentMetricsSettings.Builder	Builder for ComponentMetricsSettings.
HelidonMetric	Helidon-required behavior for each type (e.g., full-featured or no-op) of metric implementation.
KeyPerformanceIndicatorMetricsSettings	Settings for key performance indicator (KPI) metrics.
KeyPerformanceIndicatorMetricsSettings.Builder	Override default settings.
LabeledSample	Base implementation of Sample.Labeled.
LabeledSnapshot	Internal interface prescribing minimum behavior of a snapshot needed to produce output.
MetricInstance	Tuple of a metric ID and associated metric instance.
MetricsForMetadata	All metric IDs for specific metadata.
MetricsSettings	Settings which control behavior for metrics overall.
MetricsSettings.Builder	Builder for MetricsSettings.
Registry	Helidon Metric registry.
RegistryFactory	Behavior of a RegistryFactory, capable of providing metrics registries of various types (application, base, vendor) plus static methods for: creating "free-standing" registry factories according to MetricsSettings or Config (see the create methods), retrieving the singleton registry factory or updating it according to MetricsSettings or Config (see the getInstance methods), and retrieving the appropriate registry factory for a metrics-capable component, based on the component's own metrics settings combined with the overall metrics settings and whether full-featured metrics are available on the path (see the RegistryFactory.getInstance() method).
RegistryFilterSettings	Filter settings for registries.
RegistryFilterSettings.Builder	Builder for a new RegistryFilterSettings instance.
RegistrySettings	Settings which control metrics within registries (application, vendor, base) as a group or individually.
RegistrySettings.Builder	Builder for RegistrySettings.
Sample	Common behavior to all types of samples.
Sample.Derived	Sample that does not exist as an actual observation but is derived from actual observations.
Sample.Labeled	A sample with a label and a timestamp, typically representing actual observations (rather than derived values).
SampledMetric	A metric capable of providing samples.
SnapshotMetric	A metric that is capable of providing snapshots.
SystemTagsManager	Deals with global and app-level tags to be included in output for all metrics.