Enable Prometheus metrics for benchmark deployments

• Kafka Streams
• Flink
• Beam/Flink
• Beam/Samza
• Hazelcast Jet

changed milestone to %0.9.0

added modul/benchmarks/beam modul/benchmarks/flink modul/benchmarks/jet labels

marked the checklist item Kafka Streams as completed

marked the checklist item Flink as completed

mentioned in commit d38abce5

marked the checklist item Hazelcast Jet as completed

marked the checklist item Beam/Samza as completed

Hazelcast Jet metrics added with dab890ce

marked the checklist item Beam/Flink as completed

assigned to @she

Metrics for Beam/Samza and Beam/Flink are now added as well.

closed