Class MetricMetadata

Object

MetricMetadata

@StableApi
public final class MetricMetadata
extends Object

Immutable container for metric metadata: name, help, unit.

Constructor Summary

Constructors

Constructor	Description
MetricMetadata(String name)	See MetricMetadata(String, String, Unit)
MetricMetadata(String name, String help)	See MetricMetadata(String, String, Unit)
MetricMetadata(String name, String help, Unit unit)	Constructor.
MetricMetadata(String name, String expositionBaseName, String help, Unit unit)	Constructor with exposition base name.
MetricMetadata(String name, String expositionBaseName, String originalName, String help, Unit unit)	Constructor with exposition base name and original name.

Method Summary

Modifier and Type	Method	Description
String	getExpositionBaseName()	The base name for exposition, with unit suffix ensured and type suffix preserved.
String	getExpositionBasePrometheusName()	Same as getExpositionBaseName() but with all invalid characters and dots replaced by underscores.
String	getHelp()
String	getName()	The name does not include the _total suffix for counter metrics or the _info suffix for Info metrics.
String	getOriginalName()	The original name as provided by the user, before any modification.
String	getPrometheusName()	Same as getName() but with all invalid characters and dots replaced by underscores.
Unit	getUnit()
boolean	hasUnit()

Methods inherited from class Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

MetricMetadata

public MetricMetadata(String name)

See MetricMetadata(String, String, Unit)

MetricMetadata

public MetricMetadata(String name,
 String help)

See MetricMetadata(String, String, Unit)

MetricMetadata

public MetricMetadata(String name,
 @Nullable
 String help,
 @Nullable
 Unit unit)

Constructor.

Parameters:

name - must not be null. isValidMetricName(name) must be true. Use PrometheusNaming.sanitizeMetricName(String) to convert arbitrary strings into valid names.

help - optional. May be null.

unit - optional. May be null.

MetricMetadata

public MetricMetadata(String name,
 String expositionBaseName,
 @Nullable
 String help,
 @Nullable
 Unit unit)

Constructor with exposition base name.

Parameters:

name - the base name (with type suffixes stripped, e.g. "events" for a counter named "events_total")

expositionBaseName - the name with unit suffix ensured and type suffix preserved, used by format writers for smart-append logic

help - optional. May be null.

unit - optional. May be null.

MetricMetadata

public MetricMetadata(String name,
 String expositionBaseName,
 String originalName,
 @Nullable
 String help,
 @Nullable
 Unit unit)

Constructor with exposition base name and original name.

Parameters:

name - the base name (with type suffixes stripped, e.g. "events" for a counter named "events_total")

expositionBaseName - the name with unit suffix ensured and type suffix preserved

originalName - the raw name as provided by the user, before any modification

help - optional. May be null.

unit - optional. May be null.

Method Details

getName

public String getName()

The name does not include the _total suffix for counter metrics or the _info suffix for Info metrics.

The name may contain any Unicode chars. Use getPrometheusName() to get the name in legacy Prometheus format, i.e. with all dots and all invalid chars replaced by underscores.

getPrometheusName

public String getPrometheusName()

Same as getName() but with all invalid characters and dots replaced by underscores.

This is used by Prometheus exposition formats.

getOriginalName

public String getOriginalName()

The original name as provided by the user, before any modification. For example, if the user called Counter.builder().name("req").unit(BYTES), this returns "req" while getName() returns "req_bytes" and getExpositionBaseName() returns "req_bytes".

getExpositionBaseName

public String getExpositionBaseName()

The base name for exposition, with unit suffix ensured and type suffix preserved. For example, if the user called Counter.builder().name("events_total"), this returns "events_total" while getName() returns "events".

getExpositionBasePrometheusName

public String getExpositionBasePrometheusName()

Same as getExpositionBaseName() but with all invalid characters and dots replaced by underscores.

getHelp

@Nullable
public String getHelp()

hasUnit

public boolean hasUnit()

getUnit

@Nullable
public Unit getUnit()