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document how to enable only manual instrumentation (#2028) 

* #1994 document how to enable only manual instrumentation

Signed-off-by: Sergei Malafeev <sergei@malafeev.org>

* Update docs/suppressing-instrumentation.md

Co-authored-by: Trask Stalnaker <trask.stalnaker@gmail.com>

Co-authored-by: Anuraag Agrawal <anuraaga@gmail.com>
Co-authored-by: Trask Stalnaker <trask.stalnaker@gmail.com>
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docs/suppressing-instrumentation.md
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@ -29,3 +29,8 @@ so that we can try to come up with a better solution to address your need.
| System property | Environment variable | Purpose |
|--------------------------------|--------------------------------|---------------------------------------------------------------------------------------------------|
| otel.javaagent.exclude-classes | OTEL_JAVAAGENT_EXCLUDE_CLASSES | Suppresses all instrumentation for specific classes, format is "my.package.MyClass,my.package2.*" |
## Enable manual instrumentation only
You can suppress all auto instrumentations but have support for manual instrumentation with `@WithSpan` and normal API interactions by using
`-Dotel.instrumentation.default-enabled=false -Dotel.instrumentation.opentelemetry-annotations.enabled=true`