org.springframework.cloud.sleuth.annotation

Annotation Type SpanTag

@Retention(value=RUNTIME)
 @Inherited
 @Target(value=PARAMETER)
public @interface SpanTag

There are 3 different ways to add tags to a span. All of them are controlled by the annotation values. Precedence is: try with the TagValueResolver bean if the value of the bean wasn't set, try to evaluate a SPEL expression if there’s no SPEL expression just return a toString() value of the parameter

Since:

1.2.0

Author:

Christian Schwerdtfeger

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element and Description
String	expression
String	key
Class<? extends TagValueResolver>	resolver
String	value

Element Detail

value

@AliasFor(value="key")
public abstract String value

Returns:

- The name of the key of the tag which should be created.

Default:

""

key

@AliasFor(value="value")
public abstract String key

Returns:

- The name of the key of the tag which should be created.

Default:

""

expression

public abstract String expression

Returns:

- Execute this SPEL expression to calculate the tag value. Will be analyzed if no value of the resolver() was set.

Default:

""

resolver

public abstract Class<? extends TagValueResolver> resolver

Returns:

- Use this bean to resolve the tag value. Has the highest precedence.

Default:

org.springframework.cloud.sleuth.annotation.NoOpTagValueResolver.class