Thundra APM

Tagging in Go SDK

With Thundra's Go agent, you can add custom tags to your invocations or your applications, which enables you to better filter data. Invocation tags are added only to the Invocation data type; application tags are global and are automatically added to Invocation, Metric, Trace, Span, and Log data.

Adding Invocation Tags

The following code snippet shows how to add tags to an invocation:
package main
import (
// Your main lambda handler
func handler(ctx context.Context, userID string) (string, error) {
invocation.SetTag("userID", userID)
invocation.SetError(errors.New("custom error"))
return "Hello ƛ!", nil
func main() {
// Wrap your lambda handler with Thundra

Adding Application Tags

You can add application tags using environment variables. All application tags that start with thundra_agent_lambda_application_tag_ are parsed by Thundra's Go agent. The text after the thundra_agent_lambda_application_tag_ prefix is used as the key of the tag and the value of the environment variable becomes the value of the tag. For example, thundra_agent_lambda_application_tag_floatField with the value 12.123 will add an application tag to all data with the key floatField and value 12.123.
The example below shows how to add application tags with various data types to a Lambda invocation.