This chart shows Largest Contentful Paint (LCP) values for different pages on your site. The background bands are drawn by the chartjs-plugin-annotation plugin and represent Google's Core Web Vitals thresholds: green (Good, under 2500ms), yellow (Needs Improvement, 2500–4000ms), and red (Poor, over 4000ms).
The annotation plugin supports box (shaded regions), line (reference lines), point, and label annotation types. Here we use three box annotations to create the threshold bands.