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How to get metrics

Use a package​

Use a package maintained by others.

The easiest way is to use the grafana-metric with a bundler.

Use the data object​

Using the data might be a little confusing initially, but it's easier once you log the data object.

console.log(data);

Some data sources only have values.

Data object (grafana)

An example on how you could get the value from the data object above.

const valueField = data.series[0].fields[1];
const length = valueField.values.length;
const value = valueField.values.get(length - 1);
console.log(value);

Some data sources have calcs (which is easier to work with).

caution

Not all data sources have calcs. Using the values is usually a safer choice.

Data object (influx)

An example on how you could get the value from the data object above.

const value = data.series[0].fields[1].state.calcs.last;
console.log(value);

This also works

const valueField = data.series[0].fields[1];
const length = valueField.values.length;
const value = valueField.values.get(length - 1);
console.log(value);

With some checks to make sure the data exists and as a function.

function getMetric(seriesName) {
  if (data.series < 0) return null;

  const series = data.series.find((series) => series.name === seriesName);
  const fields = series.fields;

  if (fields <= 1) return null;

  const valueField = fields[1];
  const length = valueField.values.length;

  if (length <= 0) return null;

  const value = valueField.values.get(length - 1);
  return value;
}

console.log(getMetric('seriesName'));