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The Prometheus blackbox exporter samples Apache Knox WebHdfs/HBase/Hive endpoints collecting error and duration metrics.

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package de.m3y.prometheus.exporter.knox;

import java.io.IOException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Displays a welcome page containing build info and link to metrics.
 */
public class HomePageServlet extends HttpServlet {

    private final Config config;
    private final BuildInfoExporter buildInfoExporter;
    private final String knoxGatewayUrl;

    HomePageServlet(String knoxGatewayUrl, Config config, BuildInfoExporter buildInfoExporter) {
        this.knoxGatewayUrl = knoxGatewayUrl;
        this.config = config;
        this.buildInfoExporter = buildInfoExporter;
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {
        StringBuilder buf = new StringBuilder().append("\n"
                + "Apache Knox Exporter\n"
                + "\n"
                + "Apache Knox Exporter\n"
                + "Metrics\n"
                + "Build info"
                + ""
                + "App version: ").append(buildInfoExporter.getAppVersion()).append(""
                + "Build time : ").append(buildInfoExporter.getBuildTimeStamp()).append(""
                + "SCM branch : ").append(buildInfoExporter.getBuildScmBranch()).append(""
                + "SCM version : ").append(buildInfoExporter.getBuildScmVersion()).append(""
                + ""
                + "Configuration
"
                + "Knox gateway URL : ").append(knoxGatewayUrl).append(""
                + "username : ").append(config.getUsername()).append(""
                + "webHdfStatusPath : ").append(config.getWebHdfStatusPath()).append(""
                + "hiveJdbcUrl : ").append(config.getHiveJdbcUrl()).append(""
                + "hiveQuery : ").append(config.getHiveQuery()).append(""
                + "\n"
                + "");
        resp.setContentType("text/html");
        resp.getWriter().print(buf);
    }
}