Logic of the parseQuery() method in Prometheus HTTP Server

[Nipuni Chandimali]

I'm trying to understand the logic of the parseQuery() method in Prometheus HTTP Server (implemented in Java).

protected static Set<String> parseQuery(String query) throws IOException {
        Set<String> names = new HashSet<String>();
        if (query != null) {
            String[] pairs = query.split("&");
            for (String pair : pairs) {
                int idx = pair.indexOf("=");
                if (idx != -1 && URLDecoder.decode(pair.substring(0, idx), "UTF-8").equals("name[]")) {
                    names.add(URLDecoder.decode(pair.substring(idx + 1), "UTF-8"));
                }
            }
        }

            return names;

    }

Can somebody explain what is the logic behind checking whether the decoded URL sub string is equal to name[] ?

Regards
     

[Julius Volz]

See https://github.com/prometheus/client_java#http:

"All HTTP expostion integrations support restricting which time series to return using ?name[]= URL parameters."

It's just code that allows you to add "?name[]=metric_name_to_filter_by" to the end of the /metrics URL, in case you don't want the client library to return all metric names.

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Julius Volz

PromLabs - promlabs.com

[Nipuni Chandimali]

Thanks Julius for the prompt response.