title: How to draw multiple line on y axis for same x axis in chartjs v2?
body: <p>I have time series data in a database that looks like this:</p>
  <pre><code>[
    {
      min: 100,
      max: 200,
      avg: 150,
      time: 12345678.. (unix timestamp)
    },
    {
      min: ..
      ...
    }, ...
  ]
  </code></pre>
  <p>I am able to draw a line chart using the avg value by pulling it from the database as data points such as:</p>
  <pre><code>[
    {
      t: 12345678... (unix timestamp)
      y: 150 (avg value)
    },...
  ]
  </code></pre>
  <p>What I am trying to achieve is drawing three lines for min, max and avg respectively with the same dataset as:</p>
  <pre><code>[
    {
      t: 12345678... (unix timestamp),
      y1: 150 (avg value),
      y2: 100 (min value),
      y3: 200 (max value)
    },...
  ]
  </code></pre>
  <p>I have tried looking at documentation and many questions here but did not find a lead.
  I can separate the datasets but normally I am processing a lot of data on the backend and wanted to see if this can be done without any further processing.
  Want to know if this is achievable or it's chart.js' limitation?</p>