Config for disabling istio

[a-thaler]

Description

The manager currently detects at runtime if istio is available or not and then decides to manage some istio resources. The typical istio annotations are present independent of if istio is detected or not.

There can be situations where users want to use istio but run the telemetry module in non-istio mode. For that, a new module config setting is required to explicitly disable the istio mode. Also it must be assured that really any Istio feature is disabled.

Criterias

• As a user I can explicitly disable the istio mode
• Having the istio mode disabled, a running istio installation has no impact to the telemetry setup (no istio annotations are getting configured, no istio resources are generated)
• Istio input of MetricPipelineis still supported, people only want to disable running telemetry with istio
• Prometheus input of MetricPipeline does not support scraping from mtls endpoint

Reasons

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