Binary incompatibility with prometheus java simpleclient versions 0.11+

[iggyzap]

Please answer these questions before submitting a bug report.

What version of OpenCensus are you using?

0.16.1

What JVM are you using (java -version)?

openjdk version "11.0.9" 2020-10-20 OpenJDK Runtime Environment (build 11.0.9+11-alpine-r0) OpenJDK 64-Bit Server VM (build 11.0.9+11-alpine-r0, mixed mode)

What did you do?

I've instrumented java server while using prometheus simple client version 0.11.0

What did you expect to see?

No errors

What did you see instead?

Jul 28, 2021 9:38:02 PM io.opencensus.exporter.stats.prometheus.PrometheusStatsCollector describe
WARNING: Exception thrown when describing metrics.
java.lang.NoSuchFieldError: UNTYPED
	at io.opencensus.exporter.stats.prometheus.PrometheusExportUtils.<clinit>(PrometheusExportUtils.java:91)
	at io.opencensus.exporter.stats.prometheus.PrometheusStatsCollector.describe(PrometheusStatsCollector.java:149)
	at io.prometheus.client.CollectorRegistry.collectorNames(CollectorRegistry.java:98)
	at io.prometheus.client.CollectorRegistry.register(CollectorRegistry.java:50)
	at io.prometheus.client.Collector.register(Collector.java:193)
	at io.prometheus.client.Collector.register(Collector.java:186)
	at io.opencensus.exporter.stats.prometheus.PrometheusStatsCollector.createAndRegister(PrometheusStatsCollector.java:72)
	at com.hertz.htp.toyota.grpc.ThinClient.run(ThinClient.java:115)
	at com.hertz.htp.toyota.grpc.ThinClient.main(ThinClient.java:266)

[iggyzap]

Related issue in prometheus tracker: https://github.com/prometheus/client_java/issues/623

[2022H1030042G]

@iggyzap Hi, is this issue still available? If yes, I would like to work on it.