DemoPropertySource.java

/*
 * Copyright The OpenTelemetry Authors
 * SPDX-License-Identifier: Apache-2.0
 */

package com.example.javaagent;

import com.google.auto.service.AutoService;
import io.opentelemetry.javaagent.extension.config.ConfigPropertySource;
import java.util.HashMap;
import java.util.Map;

/**
 * {@link ConfigPropertySource} is an SPI provided by OpenTelemetry Java instrumentation agent. By
 * implementing it custom distributions can supply their own default configuration. The
 * configuration priority, from highest to lowest is: system properties -> environment variables ->
 * configuration file -> PropertySource SPI -> hard-coded defaults
 */
@AutoService(ConfigPropertySource.class)
public class DemoPropertySource implements ConfigPropertySource {

  @Override
  public Map<String, String> getProperties() {
    Map<String, String> properties = new HashMap<>();
    properties.put("otel.exporter.otlp.endpoint", "http://backend:8080");
    properties.put("otel.exporter.otlp.insecure", "true");
    properties.put("otel.config.max.attrs", "16");
    return properties;
  }
}