Add retry resilience to Agent365 exporter by nikhilNava · Pull Request #248 · microsoft/opentelemetry-distro-python

Nikhil Navakiran (nikhilNava) · 2026-08-14T22:58:49Z

Summary

add durable store-and-forward delivery for Agent365 telemetry that cannot be sent immediately
align Python behavior with the hardened retry-resilience contract in Add retry resilience to Agent365 exporter opentelemetry-distro-dotnet#137
add a per-identity transmission gate with Retry-After support, jittered exponential backoff, and one half-open probe
persist validated identity/payload records in a secure SQLite queue and replay them with fresh tokens and endpoints
replace the SDK batch processor on this path with an atomic, drain-safe Agent365 batch worker
make replay/exporter shutdown deterministic and fork-safe

Hardening parity

retryable/permanent HTTP and transport classification
numeric and HTTP-date Retry-After handling with a one-hour cap
concurrent closed-state traffic and one half-open probe
overflow-safe exponential backoff
identity-only durable schema with transactional v1 migration
poison-record deletion without blocking later records
fresh endpoint reconstruction and refusal to send bearer tokens over plaintext replay endpoints
pass-sized cross-process replay leases and delete-failure duplicate diagnostics
permanent-failure isolation by identity
effective batch option validation across explicit values, OTEL_BSP_* environment variables, and defaults
atomic queue capacity, threshold wake-up, force-flush accounting, fork reinitialization, and drain-before-shutdown
single-owner replay/storage/session cleanup

SQLite is intentionally used instead of the .NET file-per-record storage implementation; the externally observable retry, replay, safety, and lifecycle guarantees are aligned.

Validation

469 passed, 8 skipped for non-integration tests/a365
116 passed, 4 skipped, 8 subtests passed for focused exporter, replay, processor, and distro coverage
Black: changed files clean
pylint: no error-category findings in changed production files
mypy: changed exporter files clean
git diff --check origin/main...HEAD: clean
pyproject.toml and uv.lock: unchanged

The local full-suite environment has a pre-existing Azure Monitor exporter API mismatch; before the final hardening fixes, the branch and origin/main had identical failing/erroring test IDs. The affected A365 suites were rerun after the final fixes.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

…tro-python

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

- Use isolation_level=None + explicit BEGIN IMMEDIATE/COMMIT/ROLLBACK everywhere - Prune expired rows inside claim() transaction - Use os.mkdir(mode=0o700)+chmod for POSIX directory; enforce mode on existing dirs - Replace global Path.stat patch with module-local os.stat mock in ownership test - Add tests: autocommit mode assertion, claim-prunes-expired-rows Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

…op-pass, and new tests - Export ReplayIdentityError for identity/token-resolution failures; catching it releases the current record and gate probe then continues the batch. - Unexpected (general) exceptions now release the current record, release remaining leased records, and abort the pass. - Add test_replay_releases_record_when_identity_error_and_continues, test_general_exception_releases_current_and_remaining_and_stops, test_gate_blocked_releases_record_without_send, test_start_after_shutdown_is_safe_noop, and test_mid_batch_stop_releases_remaining_records. - Clarify in code comments why PERMANENT disposition calls record_success (identity is healthy; only the payload was rejected). - Document that start() after shutdown() is a safe no-op via docstring and debug log. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Replace the synchronous sleep/retry loop and global circuit breaker with a classified single-send (_post_once), a per-identity TransmissionGate, a durable SQLite queue, and background replay that rebuilds auth from each record's identity with a freshly resolved token. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Wire a365_exporter_disable_offline_storage and a365_exporter_storage_directory kwargs through _constants.py, use_microsoft_opentelemetry, _append_a365_components, Agent365ExporterOptions, and create_a365_components into _Agent365Exporter. Defaults: storage enabled, directory None. Document at-least-once semantics, 2-day/50-MB limits, and the security note that stored OTLP payloads may contain prompts when sensitive-data capture is enabled. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Address accumulated review findings without changing the fixed 50 MB / 2 day / 10-record behavior or adding dependencies: - Live export: release the per-identity gate probe and persist the payload if _post_once raises unexpectedly, so an identity is never permanently gated. - Replay: add a fixed periodic wake (30s background cadence) plus immediate continuation after a fully-drained maximal batch, so a startup backlog larger than one pass is not left at >10 records until an external wake. - Gate: add release_probe and record_success coverage tests. - Persistent storage: use non-symlink-following lstat for POSIX ownership, reject symlinked queue directories, and prefer creating ~/.local/state instead of falling back to a temp dir merely because it does not exist. - Options: reject an explicitly empty/whitespace storage_directory with ValueError, add a coerce_storage_directory helper, and strengthen end-to-end and no-leak coverage for the public option. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Address final-review findings in the A365 durable delivery persistent storage: - PersistentStorage.store capacity accounting used page_count * page_size, which counts freed (freelist) pages because SQLite does not shrink the file on delete. After a fill -> claim/delete -> refill cycle the queue stayed at its high-water mark and permanently rejected new records. Switch to live-page accounting ((page_count - freelist_count) * page_size) with defensive nonnegative handling, keeping the check inside the existing BEGIN IMMEDIATE transaction under the instance lock (atomicity/thread safety retained). Add a regression test that fills near a small cap, claims/deletes every record, and proves new records can be stored again. - Security hardening: create the leaf queue directory with mode=0o700 before the existing chmod, and after WAL journal initialization restrict the DB and any existing -wal/-shm sidecars to mode 0600 on POSIX (relying on the 0700 directory for future sidecar creation). Add targeted POSIX tests (skipped on Windows) plus a Windows-runnable unit test for the sidecar restriction, without weakening the existing ownership/symlink checks. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Fixes two defects identified in re-review: 1. Backoff overflow (durable_delivery.py) - 2.0 ** failure_count raised OverflowError once failure_count reached ~1024 (Python float / C double limit). - Added _MAX_BACKOFF_EXPONENT = ceil(log2(cap / floor)) = 9, derived directly from _RETRY_AFTER_CAP_SECONDS / _RETRY_AFTER_FLOOR_SECONDS. - Clamp the exponent in _full_jitter_backoff before computing the power. - Saturate state.failure_count at _MAX_BACKOFF_EXPONENT in ecord_retryable_failure so the counter cannot grow unbounded. 2. Replay thread fragility (replay_coordinator.py) - An unexpected exception escaping un_once inside _run_loop would terminate the daemon thread permanently and silently disable all future replay. - Wrapped the inner drain loop with �xcept Exception: _logger.exception(…) so the outer loop continues on the next periodic wake. - BaseException is not caught, preserving clean shutdown behaviour. Regression tests added: - test_record_retryable_failure_never_raises_beyond_exponent_1024 - test_backoff_stays_capped_at_3600_seconds_beyond_exponent_1024 - test_half_open_behavior_preserved_after_high_failure_count - test_failure_count_does_not_grow_unbounded - test_run_loop_survives_unexpected_exception_from_run_once All 34 durable-delivery/replay tests pass; 396 A365 non-integration tests pass; pylint 10.00/10; mypy clean on changed production files. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Address all four review findings against the durable-delivery batch span processor hardening: 1. Wake the worker as soon as the queue reaches max_export_batch_size instead of only on the periodic schedule/flush/shutdown, closing an avoidable drop/stall window during bursts between schedule ticks. Adds a deterministic long-delay-burst regression (schedule_delay_millis=24h) proving threshold-wake alone drains repeated bursts with zero drops. 2. Restore fork safety equivalent to upstream BatchSpanProcessor: a forked child now reinitializes its condition/queue/counters/drop-log state/worker thread from scratch via a new _init_state_after_fork(), invoked both from __init__ and from a new _at_fork_reinit(). Adds an os.register_at_fork(after_in_child=...) hook wrapped in a weakref.WeakMethod (avoiding a permanent leak, since register_at_fork has no unregister API), plus a PID guard (_check_fork_reinit()/self._pid) checked on every _enqueue() call as a fallback. Adds POSIX-only real os.fork() tests (via multiprocessing.Process) proving the child exports independently and that force_flush()/shutdown() do not hang in the child; these correctly skip on Windows. 3. Preserve OTEL_BSP_MAX_QUEUE_SIZE, OTEL_BSP_SCHEDULE_DELAY, OTEL_BSP_MAX_EXPORT_BATCH_SIZE, and OTEL_BSP_EXPORT_TIMEOUT environment-variable defaults when the corresponding constructor arg is None, via a new _int_env_default() helper mirroring upstream's _default_* pattern: invalid (non-integer) env values are logged and fall back to the hardcoded default instead of raising. Explicit constructor args still always take precedence. 4. Move per-drop and post-shutdown-drop logging out of _enqueue()'s critical section: rejection paths now only set a local drop_reason string while self._condition is held, and the new _log_dropped_span() throttled logger call happens strictly after the lock is released. Throttling uses a separate _drop_log_lock (never held during the actual log call) so a stuck/blocking log handler can never stall the condition or any producer. Adds a test that attaches a deliberately-blocking log handler and proves neither the condition nor a second concurrent producer is blocked, plus a test that 100 rapid post-shutdown drops produce exactly 1 throttled log record. Also redesigns the pre-existing test_on_end_capacity_race_never_silently_evicts, whose static queue-length snapshot assumption ("the worker cannot wake spontaneously during the race window") is invalidated by the correct threshold-wake fix, given max_export_batch_size <= max_queue_size is already enforced. Now asserts conservation (accepted+dropped==total), no duplicate exports, and a bounded accepted-count range. Adds a new deterministic test_on_end_rejects_explicitly_once_queue_is_at_capacity that manually pre-fills the queue under the lock (bypassing notify_all()) to restore full race-free coverage of "reject at capacity, don't evict". Verified via TDD (red then green) on Windows, plus real POSIX execution in a Linux container (mounting the root venv's site-packages read-only, no network access) which caught two genuine bugs invisible to source-only review: the capacity-race test's invalidated timing assumption, and a new fork test's incorrect exact-batch-count assumption under real concurrent thread interleaving (fixed to assert total delivered count instead). Test results: 25 passed/3 skipped on Windows (POSIX-only fork tests skip), 28 passed on Linux (all included), stable across repeated runs. TestA365BatchProcessorKwargs: 8 passed. Broader distro -k "A365" and full-repo-suite failures confirmed identical before/after via git stash (pre-existing/unrelated). A365 non-integration suite: 462 passed/7 skipped, zero regressions (one unrelated, pre-existing flaky test in test_persistent_storage.py observed and documented, unaffected by this change). Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Close the gap where exporter.shutdown() would close durable storage and the HTTP session after only a fixed 5s join, even if the replay thread was still mid-send. shutdown() now waits (unbounded) for the replay thread to actually exit before closing storage/session, and concurrent shutdown() callers wait for that single owner's cleanup to finish instead of returning immediately. - ReplayCoordinator.shutdown(timeout_seconds=None) defaults to an unbounded join; a finite value still performs a bounded wait. Recording the stop request happens regardless of the timeout, and a defensive guard makes a (currently unreachable) self-join return False instead of raising. - _Agent365Exporter.shutdown() now has a single cleanup owner (the first caller under the lock); it joins replay unbounded, then closes storage and the session, then signals a completion event. Non-owner callers wait on that event instead of returning early, so every call only returns once cleanup has actually finished. - Added regression coverage: exporter shutdown blocking on an in-flight replay send before closing storage/session, concurrent shutdown callers closing storage/session exactly once, ReplayCoordinator's new unbounded default, and a durable-restart lifecycle test for the same shutdown ordering. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

- Fix Windows clock-race flake in test_expired_records_are_cleaned_up by inserting the pre-expired record via insert_raw_record (established convention) instead of two back-to-back time.time() calls that could tie on Windows' coarse clock. - Remove redundant local urlparse reimport in _post_once (already imported at module scope). - Apply black (line-length=120) to 11 files that had drifted from canonical formatting; no functional changes. - Strip pre-existing trailing whitespace / EOF blank lines in build/getting_started_with_kairo_exporter and docs/superpowers files so git diff --check origin/main...HEAD is clean. - Document replay endpoint/token reconstruction, poison-record discarding, and drain-safe shutdown in A365_DOCUMENTATION.md and CHANGELOG.md. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

github-actions · 2026-08-14T23:00:42Z

Performance comparison

Threshold: regressions >15.0% on gating scenarios fail the build. Higher ops/s is better; positive Δ means the PR is slower.

Scenario	Gating	Baseline (ops/s)	Candidate (ops/s)	Δ %	Status
`azure_monitor_log`	yes	19,147.2	18,893.2	+1.34%	✅
`azure_monitor_span`	yes	154,990.7	154,750.9	+0.15%	✅
`otel_log`	no	22,354.9	22,141.5	+0.96%	✅
`otel_span`	no	38,807.8	38,286.3	+1.36%	✅

Copilot

Pull request overview

This PR adds retry-resilient, durable “store-and-forward” delivery for the Agent365 exporter, aligning Python behavior with the hardened durability/retry contract established in the .NET distro. It introduces a per-identity transmission gate with Retry-After support, a secure SQLite-backed queue, and a dedicated drain-safe batch worker to make replay and shutdown deterministic and fork-safe.

Changes:

Implement durable delivery primitives: DeliveryResult/DeliveryDisposition, per-identity TransmissionGate, HTTP-date Retry-After parsing, and a background ReplayCoordinator.
Add secure SQLite persistence (PersistentStorage) with schema migration, poisoning/validation behavior, leases, retention, and capacity accounting.
Replace the SDK BatchSpanProcessor usage on the A365 path with an A365-owned batch worker and expose offline-storage configuration end-to-end (distro/options/helpers), with expanded tests and documentation.

Reviewed changes

Copilot reviewed 29 out of 29 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/test_distro.py	Adds validation/forwarding coverage for batch kwargs and new offline-storage distro kwargs.
tests/a365/test_utils.py	Updates `parse_retry_after` tests to cover HTTP-date parsing and relative delta behavior.
tests/a365/test_replay_coordinator.py	Adds comprehensive unit tests for replay pass behavior, failure handling, wake/shutdown semantics.
tests/a365/test_persistent_storage.py	Adds extensive tests for SQLite queue behavior: migration, validation, retention, leases, capacity, and permissions.
tests/a365/test_payload_chunking.py	Updates exporter chunking tests to the new `_post_once`/`DeliveryResult` contract and durable-delivery gating behavior.
tests/a365/test_handler.py	Adds tests ensuring offline-storage options are surfaced and forwarded through the public handler APIs.
tests/a365/test_enriching_span_processor.py	Adds large suite validating the new A365-owned batch processor (capacity, lifecycle, env defaults, fork-safety).
tests/a365/test_durable_restart.py	Adds restart/durability tests validating replay with fresh tokens/endpoints and drain-safe shutdown.
tests/a365/test_durable_delivery.py	Adds tests for delivery dispositions and `TransmissionGate` retry/backoff behavior (including overflow bounds).
tests/a365/test_contextual_token_resolver.py	Updates contextual token resolver tests to new send contract and durable-delivery-disabled behavior.
tests/a365/test_circuit_breaker.py	Migrates legacy circuit-breaker tests to `TransmissionGate` and exporter integration semantics.
src/microsoft/opentelemetry/a365/core/exporters/utils.py	Adds HTTP-date `Retry-After` parsing, storage directory coercion, and forwards offline-storage options through helper construction.
src/microsoft/opentelemetry/a365/core/exporters/replay_coordinator.py	Introduces replay coordinator thread/pass logic and error handling model for durable replay.
src/microsoft/opentelemetry/a365/core/exporters/persistent_storage.py	Introduces secure SQLite-backed durable queue with schema migration and validation.
src/microsoft/opentelemetry/a365/core/exporters/enriching_span_processor.py	Reimplements A365 batch processing with atomic enqueue, threshold wake, deterministic shutdown, and fork-safety.
src/microsoft/opentelemetry/a365/core/exporters/durable_delivery.py	Adds delivery result types and per-identity gate with capped jittered exponential backoff and probe semantics.
src/microsoft/opentelemetry/a365/core/exporters/agent365_exporter.py	Integrates durable delivery: gating, persistence, replay lifecycle, `_post_once` classification, and deterministic shutdown.
src/microsoft/opentelemetry/a365/core/exporters/agent365_exporter_options.py	Adds offline-storage options and validation to exporter options.
src/microsoft/opentelemetry/a365/core/exporters/init.py	Re-exports durable delivery helper types for package consumers.
src/microsoft/opentelemetry/_distro.py	Adds distro kwargs for offline storage and validates batch/storage options before component construction.
src/microsoft/opentelemetry/_constants.py	Adds constants for new distro kwargs.
README.md	Documents new offline-storage knobs for `use_microsoft_opentelemetry`.
docs/superpowers/specs/2026-08-14-a365-durable-delivery-hardening-design.md	Adds hardening design spec referencing parity goals and behavioral guarantees.
docs/superpowers/specs/2026-08-12-a365-durable-delivery-design.md	Adds initial durable-delivery design spec and contract description.
docs/superpowers/plans/2026-08-14-a365-durable-delivery-hardening.md	Adds implementation plan for hardening tasks and associated regression tests.
docs/superpowers/plans/2026-08-12-a365-durable-delivery.md	Adds implementation plan for initial durable delivery feature.
CHANGELOG.md	Documents new offline-storage options and durable delivery semantics.
A365_DOCUMENTATION.md	Adds durable delivery documentation and security considerations for on-disk payload storage.

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+# Real (not simulated) fork-safety coverage needs the multiprocessing "fork"
+# start method, which only exists on POSIX. Resolve this once, defensively,
+# so a start method already configured by another plugin/module never turns
+# into an import-time crash -- it just disables the POSIX-only tests below.
+_FORK_AVAILABLE = hasattr(os, "fork")
+if _FORK_AVAILABLE:
+    try:
+        if multiprocessing.get_start_method(allow_none=True) is None:
+            multiprocessing.set_start_method("fork")
+        _FORK_AVAILABLE = multiprocessing.get_start_method(allow_none=True) == "fork"
+    except RuntimeError:
+        _FORK_AVAILABLE = False


Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

nikhilc-microsoft and others added 30 commits August 3, 2026 10:13

docs: design Kairo guardrail span sample

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feat: add Kairo sample input guardrail

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test: log Kairo guardrail export payload

71b043d

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fix: address Task 2 review findings

b83760c

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feat: instrument Kairo sample guardrail span

a8e3509

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fix: address Task 3 review findings

4fc8d66

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

chore: remove temporary guardrail artifacts

f2e1b27

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Merge branch 'main' of https://github.com/microsoft/opentelemetry-dis…

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…tro-python

Merge branch 'main' of https://github.com/microsoft/opentelemetry-dis…

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…tro-python

Document A365 durable delivery design

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Plan A365 durable delivery implementation

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Ignore local worktrees

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Add A365 transmission gate

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Add secure A365 persistent storage

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Append Task 2 fix report to task-2-report.md

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Remove SDD scratch report

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Add A365 durable replay coordinator

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Document A365 durable delivery hardening

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Plan A365 durable delivery hardening

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Harden A365 retry timing and transmission gate

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Harden durable schema and replay replay-endpoint security

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Harden A365 replay terminal accounting

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Add batch regression coverage for replay deletes

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nikhilc-microsoft and others added 11 commits August 14, 2026 13:24

Stop tracking SDD task report

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Remove durable delivery scratch report

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Isolate A365 permanent failures and validate batching

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Add drain-safe A365 batch processing

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Fix Task 6 shutdown hardening follow-up

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Fix final durable delivery review findings

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Remove unrelated Kairo sample artifacts

1bc63f9

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Keep durable delivery PR scope focused

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Copilot AI lite review requested due to automatic review settings August 14, 2026 22:58

Nikhil Navakiran (nikhilNava) requested review from Jackson Weber (JacksonWeber), Nev (MSNev), Hector Hernandez (hectorhdzg), Jeremy Voss (jeremydvoss), Leighton Chen (lzchen) and Radhika Gupta (rads-1996) as code owners August 14, 2026 22:58

Copilot started reviewing on behalf of Nikhil Navakiran (nikhilNava) August 14, 2026 22:59 View session

Copilot AI reviewed Aug 14, 2026

View reviewed changes

Fix A365 batch processor lint

0ef5e66

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Add retry resilience to Agent365 exporter - #248

Add retry resilience to Agent365 exporter#248
Nikhil Navakiran (nikhilNava) wants to merge 42 commits into
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Nikhil Navakiran (nikhilNava) commented Aug 14, 2026

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Hardening parity

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