munin_fee.js

const fees = require('bitcoinfees-21co');
const task = require('promise-util-task');
const munin = require('munin-plugin');
const api = fees.FeesApi;

const graphRecommended = (res) => {
    const g = new munin.Graph('bitcoin feerate','satoshi/byte','bitcoin');
    Object.keys(res).forEach(key => {
        g.add(new munin.Model.Default(key).setValue(res[key]));
    })
    g.sortLabel();
    return g
}

const graphList = (res) => {
    const data = res.reduce((r,v) => {
        return r + v.memCount
    }, 0)
    const g = new munin.Graph('bitcoin mempool','transactions','bitcoin');
    g.add(new munin.Model.Default("mempool").setValue(data));
    return g
}

const process = () =>
    task.seq([
        () => api.recommended().then(res => graphRecommended(res)),
        () => api.list().then(res => graphList(res.fees))
    ]).then(list => munin.create(list) )

const main = () => process()

main()