Document PHP feature flag telemetry#37093
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Motivation
The base PHP Feature Flags docs add setup and evaluation flows. Exposures and flag evaluation metrics are not ready to publish yet because the PHP telemetry path is currently blocked by a Rust version mismatch. This stacked PR queues the documentation now so it can land when that blocker is resolved, while still giving PHP customers the same guidance as the other server SDK docs for confirming flag evaluation counts and experiment exposures.
Changes
This PR extends the PHP server SDK page with
DD_METRICS_OTEL_ENABLED=true, notes that non-flat context attributes affect targeting and exposure reporting, and adds troubleshooting entries forfeature_flag.evaluationsand experiment exposures. It keeps the minimum PHP tracer prerequisite from the base docs asdatadog/dd-trace1.20.0 or later and uses the same terminology as the shared server SDK docs.Decisions
This is stacked on #37089 so the first PR can land the core PHP setup separately from telemetry docs. The troubleshooting language follows the Java server SDK structure: flag evaluation metrics are described separately from experiment exposures, and exposures are scoped to flags associated with an experiment rather than presented as standard flag behavior.
Validation
git diff --check.DD_METRICS_OTEL_ENABLED,feature_flag.evaluations, and experiment exposure troubleshooting in the stacked diff.