This is a Tampermonkey script for Chrome which sets the desired refresh interval for MongoDB charts since the webapp lacks the functionality to specify it via URL parameter.

charts_refreshinterval_workaround.js

// ==UserScript==
// @name         Change MongoDB Atlas Charts Public Dashboard Refresh Interval
// @namespace    https://nesto-software.de/
// @version      0.1
// @description  We implement a workaround for the following issue: https://feedback.mongodb.com/forums/923524-charts/suggestions/39964576-ability-to-set-refresh-rate-via-url-param
// @author       Martin Löper <martin.loeper@nesto-software.de>
// @match        https://charts.mongodb.com/*/public/dashboards/*
// @grant        none
// @run-at       document-start
// ==/UserScript==

const KEY = "persist:mongodb-charts:refresh-entities";
const DESIRED_REFRESH_INTERVAL = 60000;

(function() {
    var check = function() {
        console.log("Checking if refresh settings match desired value.");

        var refreshSettings = localStorage.getItem(KEY);
        if(!refreshSettings) {
            console.log("Local storage key '" + KEY + "' is not set. Cancelling.");
            return;
        }

        var refreshSettingsParsed = JSON.parse(refreshSettings);
        var ids = JSON.parse(refreshSettingsParsed.ids);
        var refreshEntitiesParsed = JSON.parse(refreshSettingsParsed.entities);
        var hasChanges = false;

        for (var i = 0; i < ids.length; i++) {
            var id = ids[i];
            console.log("We inspect refresh entity with id: " + id);
            var refreshEntityParsed = refreshEntitiesParsed[id];
            var refreshInterval = refreshEntityParsed.refreshInterval;

            // change the value if not already desired value
            if (refreshInterval != DESIRED_REFRESH_INTERVAL) {
                if(!refreshInterval) {
                    console.log("No original value found. Cancelling.");
                    return;
                }

                refreshEntityParsed.refreshInterval = DESIRED_REFRESH_INTERVAL;
                refreshEntitiesParsed[id] = refreshEntityParsed;
                hasChanges = true;

                console.log("We changed the MongoDB Charts refresh interval to: " + DESIRED_REFRESH_INTERVAL + ". Was: " + refreshInterval);
            } else {
                console.log("Refresh Interval already " + DESIRED_REFRESH_INTERVAL + ". Thus doing nothing.");
            }
        }

        refreshSettingsParsed.entities = JSON.stringify(refreshEntitiesParsed);
        refreshSettings = JSON.stringify(refreshSettingsParsed);
        localStorage.setItem(KEY, refreshSettings);

        if (hasChanges) {
           console.log("Reloading the page to make sure the change propagates...");
           window.location.reload();
        }
    }

    // since the storage event is only triggered from other windows, we also check periodically
    window.setInterval(check, 60000);
    window.setTimeout(check, 10000);

    check();
})();