// prometheus.Collector interface.
type MetricsGroup struct {
	// Path (relative to the Metrics v3 base endpoint) at which this group of
	// metrics is served. This value is converted into a metric name prefix
	// using `.metricPrefix()` and is added to each metric returned.
	CollectorPath collectorPath
	// List of all metric descriptors that could be returned by the loader.

     * @param repository The repository that caused the error, may be {@code null}.
     */
    public InvalidRepositoryException(String message, Repository repository) {
        super(message);
        this.repository = repository;
    }

    /**
     * Gets the repository that causes this error (if any).
     *
     * @return The repository that causes this error or {@code null} if not known.
     */

-->

#### What type of PR is this?

<!--
Add one of the following kinds:
/kind bug
/kind cleanup
/kind documentation
/kind feature

Optionally add one or more of the following kinds if applicable:
/kind api-change
/kind deprecation
/kind failing-test
/kind flake
/kind regression
-->

#### What this PR does / why we need it:

No more typing the wrong key names, coming back and forth between docs, or scrolling up and down to find if you finally used `username` or `user_name`.

### Short

It has sensible **defaults** for everything, with optional configurations everywhere. All the parameters can be fine-tuned to do what you need and to define the API you need.

final class SortedLists {
  private SortedLists() {}

  /**
   * A specification for which index to return if the list contains at least one element that
   * compares as equal to the key.
   */
  enum KeyPresentBehavior {
    /**
     * Return the index of any list element that compares as equal to the key. No guarantees are
     * made as to which index is returned, if more than one element compares as equal to the key.
     */

  private String suiteName;
  private @Nullable Runnable setUp;
  private @Nullable Runnable tearDown;

  // public so that it can be referenced in generated GWT tests.
  @Override
  public void setUp() throws Exception {
    if (setUp != null) {
      setUp.run();
    }
  }

  // public so that it can be referenced in generated GWT tests.
  @Override
  public void tearDown() throws Exception {
    if (tearDown != null) {

  private String suiteName;
  private @Nullable Runnable setUp;
  private @Nullable Runnable tearDown;

  // public so that it can be referenced in generated GWT tests.
  @Override
  public void setUp() throws Exception {
    if (setUp != null) {
      setUp.run();
    }
  }

  // public so that it can be referenced in generated GWT tests.
  @Override
  public void tearDown() throws Exception {
    if (tearDown != null) {

      return this;
    }

    // Holder object for values that might be null and/or empty.
    static class ValueHolder {
      @CheckForNull String name;
      @CheckForNull Object value;
      @CheckForNull ValueHolder next;
    }

    /**
     * Holder object for values that cannot be null or empty (will be printed unconditionally). This

    /**
     * Gets the external profiles that were active during model building. External profiles are those that were
     * contributed by {@link ModelBuildingRequest#getProfiles()}.
     *
     * @return The active external profiles or an empty list if none, never {@code null}.
     */
    List<Profile> getActiveExternalProfiles();

    /**

        }
        return result;
      }
    };
  }

  /** Returns a {@link CacheLoader} that returns the given {@code constant} for every request. */
  static <K, V> ConstantLoader<K, V> constantLoader(@Nullable V constant) {
    return new ConstantLoader<>(constant);
  }

  /** Returns a {@link CacheLoader} that returns the given {@code constant} for every request. */
  static IncrementingLoader incrementingLoader() {