elastic · mergify · Aug 25, 2025
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+---
+navigation_title: "Elastic APM"
+mapped_pages:
+  - https://www.elastic.co/guide/en/observability/current/apm-release-notes.html
+  - https://www.elastic.co/guide/en/observability/master/release-notes-head.html
+---
+
+# Elastic APM release notes
+
+Review the changes, fixes, and more in each version of Elastic APM.
+
+To check for security updates, go to [Security announcements for the Elastic stack](https://discuss.elastic.co/c/announcements/security-announcements/31).
+
+% Release notes include only features, enhancements, and fixes. Add breaking changes, deprecations, and known issues to the applicable release notes sections.
+% For each new version section, include the Elastic APM and Kibana changes.
+
+% ## Next version [elastic-apm-next-release-notes]
+
+% ### Features and enhancements [elastic-apm-next-features-enhancements]
+% * 1 sentence describing the change. ([#PR number](https://github.com/elastic/apm-server/pull/PR number))
+
+% ### Fixes [elastic-apm-next-fixes]
+% * 1 sentence describing the change. ([#PR number](https://github.com/elastic/apm-server/pull/PR number))
+
+## 9.1.2 [elastic-apm-9.1.2-release-notes]
+
+## 9.1.1 [elastic-apm-9.1.1-release-notes]
+
+### Fixes [elastic-apm-9.1.1-fixes]
+
+* Fix Fleet-managed apm-server hanging or crashing on config hot reload due to duplicate monitoring registry ([#17872](https://github.com/elastic/apm-server/pull/17872))
+
+## 9.1.0 [elastic-apm-9.1.0-release-notes]
+
+### Features and enhancements [elastic-apm-9.1.0-features-enhancements]
+
+* Add config for tail-based sampling discard on write ([#13950](https://github.com/elastic/integrations/pull/13950))
+* Add config for tail-based sampling TTL ([#16579](https://github.com/elastic/apm-server/pull/16579))
+
+### Fixes [elastic-apm-9.1.0-fixes]
+
+* Truncate string slice attributes in OTLP labels ([#434](https://github.com/elastic/apm-data/pull/434))
+* Fix broken UI by explicitly enabling date detection for the `system.process.cpu.start_time` field ([#130466](https://github.com/elastic/elasticsearch/pull/130466))
+* Use representative count for the `event.success_count` metric if available ([#119995](https://github.com/elastic/elasticsearch/pull/119995))
+* Fix setting `event.dataset` to `data_stream.dataset` if `event.dataset` is empty, to have `event.dataset` in every `logs-*` data stream ([#129074](https://github.com/elastic/elasticsearch/pull/129074))
+* Fix missing trusted root certificate authority in the docker image ([#16928](https://github.com/elastic/apm-server/pull/16928))
+
+## 9.0.6 [elastic-apm-9.0.6-release-notes]
+
+## 9.0.5 [elastic-apm-9.0.5-release-notes]
+
+## 9.0.4 [elastic-apm-9.0.4-release-notes]
+
+### Fixes [elastic-apm-9.0.4-fixes]
+
+* Tail-based sampling: Fix missing or infrequent monitoring metric `lsm_size` and `value_log_size` ([#17512](https://github.com/elastic/apm-server/pull/17512))
+* Fix default tracer `http request sent to https endpoint` error when both self-instrumentation and TLS are enabled ([#17293](https://github.com/elastic/apm-server/pull/17293))
+
+## 9.0.3 [elastic-apm-9.0.3-release-notes]
+
+### Features and enhancements [elastic-apm-9.0.3-features-enhancements]
+
+* Tail-based sampling: Optimize performance for instances with more CPU and memory ([#17254](https://github.com/elastic/apm-server/pull/17254))
+
+### Fixes [elastic-apm-9.0.3-fixes]
+
+* Tail-based sampling: Fix ever-increasing dynamic group count monitoring metric ([#17042](https://github.com/elastic/apm-server/pull/17042))
+* Tail-based sampling: Fix incorrectly large pebble database `lsm_size` monitoring metric in edge cases which causes TBS to be bypassed ([#17149](https://github.com/elastic/apm-server/pull/17149))
+* Tail-based sampling: Log pubsub errors at error or warn level ([#17135](https://github.com/elastic/apm-server/pull/17135))
+
+## 9.0.2 [elastic-apm-9.0.2-release-notes]
+
+### Fixes [elastic-apm-9.0.2-fixes]
+
+* Fix missing trusted root certificate authority in the docker image ([#16928](https://github.com/elastic/apm-server/pull/16928))
+
+## 9.0.1 [elastic-apm-9.0.1-release-notes]
+
+### Fixes [elastic-apm-9.0.1-fixes]
+
+* Tail-based sampling: ignore subscriber position read error and proceed as if file does not exist to avoid crash looping ([#16736](https://github.com/elastic/apm-server/pull/16736))
+
+## 9.0.0 [9-0-0]
+
+### Features and enhancements [9-0-0-features-enhancements]
+
+* **Tail-based sampling**: Storage layer is rewritten to use Pebble database instead of BadgerDB. The new implementation offers a substantial throughput increase while consuming significantly less memory. Disk usage is significantly lower and more stable. See APM [Transaction sampling](docs-content://solutions/observability/apm/transaction-sampling.md) docs for benchmark details. ([#15235](https://github.com/elastic/apm-server/pull/15235))
+
+### Fixes [9-0-0-fixes]
+
+* Fix overflow in validation of `apm-server.agent.config.cache.expiration` on 32-bit architectures. ([#15216](https://github.com/elastic/apm-server/pull/15216))
+* Change permissions of `apm-server.yml` in `tar.gz` artifacts to `0600`. ([#15627](https://github.com/elastic/apm-server/pull/15627))