docs: Add pyroscope v1.9 release notes

docs/sources/release-notes/v1-9.md

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+---
+title: Version 1.9 release notes
+menuTitle: V1.9
+description: Release notes for Grafana Pyroscope 1.9
+weight: 550
+---
+
+# Version 1.9 release notes
+
+We are excited to present Grafana Pyroscope 1.9.
+
+We've improved stability, performance, and documentation.
+
+Notable changes are listed below. For more details, check out the full 1.9.0 changelog: https://github.com/grafana/pyroscope/compare/v1.8.0...v1.9.0.
+
+## Improvements and Updates
+* Performance improvement during profile ingestion (https://github.com/grafana/pyroscope/pull/3569, https://github.com/grafana/pyroscope/pull/3561)
+* Support resolve symbols in mini debug info (https://github.com/grafana/pyroscope/pull/3590)
+* Make service_name configurable through environment variable (https://github.com/grafana/pyroscope/pull/3589)
+* Add limit to SelectSeries API (https://github.com/grafana/pyroscope/pull/3602)
+* Add topologySpreadConstraint in Helm (https://github.com/grafana/pyroscope/pull/3539)
+* Rename GitSession to pyroscope_git_session (https://github.com/grafana/pyroscope/pull/3542)
+
+## Fixes
+* Make pprof merge thread-safe (https://github.com/grafana/pyroscope/pull/3564)
+* Fix flaky tests (https://github.com/grafana/pyroscope/pull/3571)
+* Fix slice init length (https://github.com/grafana/pyroscope/pull/3600)
+* Fix issues when porting alloy/pyroscope to android (https://github.com/grafana/pyroscope/pull/3582)
+
+## Documentation Improvements
+* Update readme to highlight explore profiles (https://github.com/grafana/pyroscope/pull/3581)
+* Update nodejs examples (https://github.com/grafana/pyroscope/pull/3555)
+* Example for Java profiling using Grafana Alloy in Kubernetes (https://github.com/grafana/pyroscope/pull/3603)