detectors/resources-support/src/main/java/com/google/cloud/opentelemetry/detection/GCPMetadataConfig.java [107:166]:
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    return region;
  }

  // Example response: projects/640212054955/machineTypes/e2-medium
  String getMachineType() {
    String machineType = getAttribute("instance/machine-type");
    if (machineType != null && machineType.contains("/")) {
      machineType = machineType.substring(machineType.lastIndexOf('/') + 1);
    }
    return machineType;
  }

  // Returns null on failure to retrieve from metadata server
  String getInstanceId() {
    return getAttribute("instance/id");
  }

  // Returns null on failure to retrieve from metadata server
  String getClusterName() {
    return getAttribute("instance/attributes/cluster-name");
  }

  // Returns null on failure to retrieve from metadata server
  String getClusterLocation() {
    return getAttribute("instance/attributes/cluster-location");
  }

  // Returns null on failure to retrieve from metadata server
  String getInstanceHostName() {
    return getAttribute("instance/hostname");
  }

  // Returns null on failure to retrieve from metadata server
  String getInstanceName() {
    return getAttribute("instance/name");
  }

  // Returns null on failure to retrieve from metadata server
  private String getAttribute(String attributeName) {
    return cachedAttributes.computeIfAbsent(attributeName, this::fetchAttribute);
  }

  // Return the attribute received at <attributeName> relative path or null on failure
  private String fetchAttribute(String attributeName) {
    try {
      URL url = new URL(this.url + attributeName);
      HttpURLConnection connection = (HttpURLConnection) url.openConnection();
      connection.setRequestProperty("Metadata-Flavor", "Google");
      if (connection.getResponseCode() == 200
          && ("Google").equals(connection.getHeaderField("Metadata-Flavor"))) {
        InputStream input = connection.getInputStream();
        try (BufferedReader reader =
            new BufferedReader(new InputStreamReader(input, StandardCharsets.UTF_8))) {
          return reader.readLine();
        }
      }
    } catch (IOException ignore) {
      // ignore
    }
    return null;
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detectors/resources/src/main/java/com/google/cloud/opentelemetry/detectors/GCPMetadataConfig.java [77:136]:
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    return region;
  }

  // Example response: projects/640212054955/machineTypes/e2-medium
  String getMachineType() {
    String machineType = getAttribute("instance/machine-type");
    if (machineType != null && machineType.contains("/")) {
      machineType = machineType.substring(machineType.lastIndexOf('/') + 1);
    }
    return machineType;
  }

  // Returns null on failure to retrieve from metadata server
  String getInstanceId() {
    return getAttribute("instance/id");
  }

  // Returns null on failure to retrieve from metadata server
  String getClusterName() {
    return getAttribute("instance/attributes/cluster-name");
  }

  // Returns null on failure to retrieve from metadata server
  String getClusterLocation() {
    return getAttribute("instance/attributes/cluster-location");
  }

  // Returns null on failure to retrieve from metadata server
  String getInstanceHostName() {
    return getAttribute("instance/hostname");
  }

  // Returns null on failure to retrieve from metadata server
  String getInstanceName() {
    return getAttribute("instance/name");
  }

  // Returns null on failure to retrieve from metadata server
  private String getAttribute(String attributeName) {
    return cachedAttributes.computeIfAbsent(attributeName, this::fetchAttribute);
  }

  // Return the attribute received at <attributeName> relative path or null on failure
  private String fetchAttribute(String attributeName) {
    try {
      URL url = new URL(this.url + attributeName);
      HttpURLConnection connection = (HttpURLConnection) url.openConnection();
      connection.setRequestProperty("Metadata-Flavor", "Google");
      if (connection.getResponseCode() == 200
          && ("Google").equals(connection.getHeaderField("Metadata-Flavor"))) {
        InputStream input = connection.getInputStream();
        try (BufferedReader reader =
            new BufferedReader(new InputStreamReader(input, StandardCharsets.UTF_8))) {
          return reader.readLine();
        }
      }
    } catch (IOException ignore) {
      // ignore
    }
    return null;
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