feat: Support stream init diagnostics events for FDv2. #133
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kinyoklion
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lib/sdk/server/src/main/java/com/launchdarkly/sdk/server/StreamingSynchronizerImpl.java
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lib/sdk/server/src/main/java/com/launchdarkly/sdk/server/StreamingSynchronizerImpl.java
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lib/sdk/server/src/main/java/com/launchdarkly/sdk/server/StreamingSynchronizerImpl.java
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tanderson-ld
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Feb 9, 2026
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Note
Medium Risk
Touches FDv2 streaming lifecycle/error handling and restart behavior, which could affect reconnection and initialization semantics; changes are guarded by extensive new unit tests and are largely additive (diagnostic recording).
Overview
Adds FDv2 streaming stream-init diagnostics by plumbing a
DiagnosticStoreintoStreamingSynchronizerImpl(viaDataSystemComponents) and recording init timestamp/duration with afailedflag.Updates streaming error/restart paths to distinguish deliberate restarts (e.g.
goodbye/caller-initiated) from failures, reset timing after the first successful changeset, and record failures on conversion/protocol/parsing errors and unexpected thread termination. Tests are expanded to validate diagnostics across success, HTTP/network errors, invalid data, and repeated restarts (including null-store safety).Written by Cursor Bugbot for commit ee478d9. This will update automatically on new commits. Configure here.