Backport of agent: remove data race in agent config into release/1.17.x #20203
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Backport
This PR is auto-generated from #20200 to be assessed for backporting due to the inclusion of the label backport/1.17.
The below text is copied from the body of the original PR.
Description
To fix an issue displaying the current reloaded config in the
v1/agent/self
endpoint #18681 caused the agent's internalconfig
struct member to be deepcopied and replaced on reload.This is not safe because the field is not protected by a lock, nor should it be due to how it is accessed by the rest of the system.
This PR does the same deepcopy, but into a new field solely for the point of capturing the current reloaded values for display purposes. If there has been no reload then the original config is used.
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