vaultwarden/src/static/templates/admin/diagnostics.hbs

<main class="container">
    <div id="diagnostics-block" class="my-3 p-3 bg-white rounded shadow">
        <h6 class="border-bottom pb-2 mb-2">Diagnostics</h6>

        <h3>Version</h3>
        <div class="row">
            <div class="col-md">
                <dl class="row">
                    <dt class="col-sm-5">Server Installed
                        <span class="badge badge-success d-none" id="server-success" title="Latest version is installed.">Ok</span>
                        <span class="badge badge-warning d-none" id="server-warning" title="There seems to be an update available.">Update</span>
                    </dt>
                    <dd class="col-sm-7">
                        <span id="server-installed">{{version}}</span>
                    </dd>
                    <dt class="col-sm-5">Server Latest
                        <span class="badge badge-danger d-none" id="server-failed" title="Unable to determine latest version.">Unknown</span>
                    </dt>
                    <dd class="col-sm-7">
                        <span id="server-latest">{{diagnostics.latest_release}}<span id="server-latest-commit" class="d-none">-{{diagnostics.latest_commit}}</span></span>
                    </dd>
                    <dt class="col-sm-5">Web Installed
                        <span class="badge badge-success d-none" id="web-success" title="Latest version is installed.">Ok</span>
                        <span class="badge badge-warning d-none" id="web-warning" title="There seems to be an update available.">Update</span>
                    </dt>
                    <dd class="col-sm-7">
                        <span id="web-installed">{{diagnostics.web_vault_version}}</span>
                    </dd>
                    <dt class="col-sm-5">Web Latest
                        <span class="badge badge-danger d-none" id="web-failed" title="Unable to determine latest version.">Unknown</span>
                    </dt>
                    <dd class="col-sm-7">
                        <span id="web-latest">{{diagnostics.latest_web_build}}</span>
                    </dd>
                </dl>
            </div>
        </div>

        <h3>Checks</h3>
        <div class="row">
            <div class="col-md">
                <dl class="row">
                    <dt class="col-sm-5">DNS (github.com)
                        <span class="badge badge-success d-none" id="dns-success" title="DNS Resolving works!">Ok</span>
                        <span class="badge badge-danger d-none" id="dns-warning" title="DNS Resolving failed. Please fix.">Error</span>
                    </dt>
                    <dd class="col-sm-7">
                        <span id="dns-resolved">{{diagnostics.dns_resolved}}</span>
                    </dd>

                    <dt class="col-sm-5">Date & Time (UTC)
                        <span class="badge badge-success d-none" id="time-success" title="Time offsets seem to be correct.">Ok</span>
                        <span class="badge badge-danger d-none" id="time-warning" title="Time offsets are too mouch at drift.">Error</span>
                    </dt>
                    <dd class="col-sm-7">
                        <span id="time-server" class="d-block"><b>Server:</b> <span id="time-server-string">{{diagnostics.server_time}}</span></span>
                        <span id="time-browser" class="d-block"><b>Browser:</b> <span id="time-browser-string"></span></span>
                    </dd>
                </dl>
            </div>
        </div>
    </div>
</main>

<script>
    (() => {
        const d = new Date();
        const year = d.getUTCFullYear();
        const month = String((d.getUTCMonth()+1)).padStart(2, '0');
        const day = String(d.getUTCDate()).padStart(2, '0');
        const hour = String(d.getUTCHours()).padStart(2, '0');
        const minute = String(d.getUTCMinutes()).padStart(2, '0');
        const seconds = String(d.getUTCSeconds()).padStart(2, '0');
        const browserUTC = year + '-' + month + '-' + day + ' ' + hour + ':' + minute + ':' + seconds;
        document.getElementById("time-browser-string").innerText = browserUTC;

        const serverUTC = document.getElementById("time-server-string").innerText;
        const timeDrift = (Date.parse(serverUTC) - Date.parse(browserUTC)) / 1000;
        if (timeDrift > 30 || timeDrift < -30) {
            document.getElementById('time-warning').classList.remove('d-none');
        } else {
            document.getElementById('time-success').classList.remove('d-none');
        }

        // Check if the output is a valid IP
        const isValidIp = value => (/^(?:(?:^|\.)(?:2(?:5[0-5]|[0-4]\d)|1?\d?\d)){4}$/.test(value) ? true : false);
        if (isValidIp(document.getElementById('dns-resolved').innerText)) {
            document.getElementById('dns-success').classList.remove('d-none');
        } else {
            document.getElementById('dns-warning').classList.remove('d-none');
        }

        let serverInstalled = document.getElementById('server-installed').innerText;
        let serverLatest = document.getElementById('server-latest').innerText;
        if (serverInstalled.indexOf('-') > -1 && serverLatest !== '-') {
            document.getElementById('server-latest-commit').classList.remove('d-none');
            serverLatest += document.getElementById('server-latest-commit').innerText;
        }

        const webInstalled = document.getElementById('web-installed').innerText;
        const webLatest = document.getElementById('web-latest').innerText;

        checkVersions('server', serverInstalled, serverLatest);
        checkVersions('web', webInstalled, webLatest);

        function checkVersions(platform, installed, latest) {
            if (installed === '-' || latest === '-') {
                document.getElementById(platform + '-failed').classList.remove('d-none');
                return;
            }

            if (installed !== latest) {
                document.getElementById(platform + '-warning').classList.remove('d-none');
            } else {
                document.getElementById(platform + '-success').classList.remove('d-none');
            }
        }
    })();
</script>