code: public Report addToTab(String tabName, String key, Object value) {
          diagnostics.metaData.addToTab(tabName, key, value);
          return this;
      }
docs: Add a key value pair to a metadata tab.
  
  @param tabName the name of the tab to add the key value pair to
  @param key     the key of the metadata to add
  @param value   the metadata value to add
  @return the modified report