templates/index.html

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>All metrics</title>
</head>
<body>
    {{ range $metricType, $metricList := . }}
    <div class="metrics-list">
        <h3 class="metrics-list__header">{{ $metricType }} values:</h3>
        <div class="metrics-list__values" style="margin-left: 20px;">
            {{ range $metricID, $metricValue := $metricList }}
                <div class="metrics-list__value"><b>{{ $metricID }}</b>: {{ $metricValue.GetStringValue }}</div>
            {{ end }}
        </div>
    </div>
    {{ end }}
</body>
</html>