def METHOD_NAME(self, ctx, experiment=None):
    """Return {runName: {tagName: {displayName: ..., description:
    ...}}}."""
    mapping = self._data_provider.list_scalars(
        ctx,
        experiment_id=experiment,
        plugin_name=metadata.PLUGIN_NAME,
    )
    result = {run: {} for run in mapping}
    for (run, tag_to_content) in mapping.items():
        for (tag, metadatum) in tag_to_content.items():
            md = metadata.parse_plugin_metadata(metadatum.plugin_content)
            if not self._version_checker.ok(md.version, run, tag):
                continue
            description = plugin_util.markdown_to_safe_html(
                metadatum.description
            )
            result[run][tag] = {
                "displayName": metadatum.display_name,
                "description": description,
            }
    return result