[KIEKER-2001] Make ExplorViz Token Id and Secret Configurable

[rju]

JIRA Issue: KIEKER-2001 Make ExplorViz Token Id and Secret Configurable
Original Reporter: David Georg Reichelt

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Currently, explorviz.token.id and explorviz.token.secret are hard-coded in the otel-transformer: https://github.com/kieker-monitoring/kieker/blob/main/tools/otel-transformer/src/kieker/tools/oteltransformer/stages/OpenTelemetryExporterStage.java#L196 This is only usable for demo purposes.

In addition to the export type, this should be somehow specified inside of the OpenTelemetry exporter stage. This is a somehow odd situation, because these two properties aren’t core OpenTelemetry properties. I see two ways to achieve this:

• Easierst: Just have it as kieker.tools.oteltransformer.stages.OpentelemetryExporterStage.ExplorViz_TokenId and .ExplorViz_Secret, and document that these are special properties
• Create a specialized ExplorVizExporterStage again, that inherits from the OpenTelemetryExporterStage and also sets these both properties

We should discuss at the Kieker meeting how to address this and then implement it.