code: def __get_threshold_elements(
      plot_table,
      metrics,
      fairness_threshold,
      ref_group,
      scales,
      chart_height,
      concat_chart,
      accessibility_mode=False,
      warnings=(),
  ):
      """Gets fairness threshold elements (rules, bands and text) for the chart."""
  
      lower_values = []
      upper_values = []
  
      # CREATE THRESHOLD DF
      for metric in metrics:
          # Get reference value for each metric
          ref_group_value = plot_table.loc[
              plot_table["attribute_value"] == ref_group
          ][metric].iloc[0]
  
          # Enforce max upper boundary on 1
          upper_values.append(
              min(ref_group_value * fairness_threshold, 1)
          )
  
          lower_values.append(ref_group_value / fairness_threshold)
  
      # Convert to uppercase to match bubbles' Y axis
      metrics_labels = [metric.upper() for metric in metrics]
  
      threshold_df = pd.DataFrame(
          {
              "lower_end": 0,
              "upper_end": 1,
              "lower_threshold_value": lower_values,
              "upper_threshold_value": upper_values,
              "metric": metrics_labels,
          }
      )
  
      # RULES
      upper_threshold_rules = __draw_threshold_rules(
          threshold_df, scales, "upper", accessibility_mode
      )
      lower_threshold_rules = __draw_threshold_rules(
          threshold_df, scales, "lower", accessibility_mode
      )
  
      # BANDS
      threshold_bands = __draw_threshold_bands(
          threshold_df, scales, accessibility_mode
      )
  
      # HELPER TEXT
      if concat_chart:
          return (
              lower_threshold_rules
              + upper_threshold_rules
              + threshold_bands
          )
      else:
          threshold_text = __draw_threshold_text(
              fairness_threshold,
              ref_group,
              chart_height,
              accessibility_mode,
              warnings,
          )
  
          return (
              lower_threshold_rules
              + upper_threshold_rules
              + threshold_bands
              + threshold_text
          )
  
imports: import altair
  import pandas
  from aequitas.plot.commons.helpers import no_axis, transform_ratio, get_chart_metadata
  from aequitas.plot.commons.legend import draw_legend
  from aequitas.plot.commons.scales import get_chart_size_range
  from aequitas.plot.commons.tooltips import get_tooltip_text_group_size, get_tooltip_text_disparity_explanation
  from aequitas.plot.commons.style.classes import Metric_Axis, Axis, Threshold_Band, Threshold_Rule, Annotation, Bubble, Rule, Chart_Title
  from aequitas.plot.commons.style.sizes import Metric_Chart
  from aequitas.plot.commons.style.text import FONT, FONT_SIZE_SMALL
  from aequitas.plot.commons import initializers
  from aequitas.plot.commons import labels
label_desc: Use image node_id 8 for calling a global function with example usage: __get_threshold_elements(plot_table, metrics, fairness_threshold, ref_group, scales, chart_height, concat_chart, accessibility_mode, warnings) and returns: unknown, unknown