feat: Kafka FUP Phase I

[CagriYonca]

Changes:

• The customers are able to use configuration.yaml file to filter specific services and methods now, as specified in the technical specification.
• Specific topics and specific methods can be filtered using one of the below, configuration.yaml file has the highest priority, use send for kafka-python and produce for confluent-kafka:
  • os.environ["INSTANA_IGNORE_ENDPOINTS"] = "kafka:send,consume"
  • os.environ["INSTANA_IGNORE_ENDPOINTS"] = "kafka:produce,consume"
  • os.environ["INSTANA_IGNORE_ENDPOINTS"] = "kafka"
  • os.environ["INSTANA_IGNORE_ENDPOINTS_PATH"] = "configuration.yaml"

[GSVarsha]

Why is pyyaml a dependency for the tracer?

[pvital]

@GSVarsha, that's because we need to read YAML configuration files now. This is part of the design.

I don't like the idea of having it as one of the main dependencies of our package. Perhaps we can add it as an extra installation option. The users would then execute something like the following command if they want to use the Kafka filtering:

pip install instana[yaml]