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GeezerVison is showing github.com — feat: Support HTTP in MCP by Anarion-zuo · Pull Request #6109 · feast-dev/feast

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@Anarion-zuo

@Anarion-zuo Anarion-zuo commented Mar 15, 2026 •
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What this PR does / why we need it:

This PR adds first-class support for Streamable HTTP MCP transport in the Feast Python Feature Server to address reliability issues with the legacy SSE-based MCP endpoint and eliminate the need for external proxies in common MCP clients.

Key changes:

  • Adds mcp_transport configuration for MCP feature server ( sse | http ), defaulting to sse for backwards compatibility.

  • When mcp_transport=http , mounts MCP using Streamable HTTP via FastApiMCP.mount_http() .

  • When mcp_transport=sse , preserves existing behavior, preferring mount_sse() when available (fallback to deprecated mount() for older fastapi_mcp versions).

  • Fails fast with a clear error when mcp_transport=http is configured but the installed fastapi_mcp version does not support mount_http() .

  • Adds/updates unit + integration tests covering transport selection and failure modes.

  • Updates docs and example configuration to show how to enable Streamable HTTP and avoid the GET /mcp 406 by using the correct Accept header.
    Touched areas:

  • MCP config + mounting logic: mcp_config.py , mcp_server.py , feature_server.py

  • Tests: test_mcp_server.py , test_mcp_feature_server.py

  • Docs/examples: genai.md , mcp-feature-server.md , feature_store.yaml

Which issue(s) this PR fixes:

Fixes #5853.

Misc

Tests run locally:

  • pytest sdk/python/tests/unit/infra/feature_servers/test_mcp_server.py

  • pytest sdk/python/tests/integration/test_mcp_feature_server.py
    Notes:

  • Default remains mcp_transport: sse to avoid behavior changes for existing deployments.

  • For Streamable HTTP, a plain GET /mcp may return 406 unless the client includes Accept: text/event-stream (expected by the transport).


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@Anarion-zuo
Anarion-zuo requested a review from a team as a code owner March 15, 2026 13:07
@Anarion-zuo Anarion-zuo mentioned this pull request Mar 15, 2026
Support Streamable HTTP transport for Feature Server MCP integration #5853
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devin-ai-integration[bot]
devin-ai-integration Bot reviewed Mar 15, 2026
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✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 3 additional findings.

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franciscojavierarceo
franciscojavierarceo reviewed Mar 16, 2026
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Comment thread .github/workflows/unit_tests.yml Outdated
- name: Minimize uv cache
run: uv cache prune --ci

mcp-feature-server-runtime:

@franciscojavierarceo franciscojavierarceo Mar 16, 2026

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this should go in integration tests please

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@Anarion-zuo Anarion-zuo Mar 17, 2026

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Is it this one? .github/workflows/pr_integration_tests.yml

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franciscojavierarceo
franciscojavierarceo reviewed Mar 16, 2026
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Comment thread sdk/python/feast/ui_server.py Outdated
tls_key_path: str = "",
tls_cert_path: str = "",
):
import uvicorn

@franciscojavierarceo franciscojavierarceo Mar 16, 2026

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why move this here?

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@Anarion-zuo Anarion-zuo Mar 17, 2026

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No need to import this if start_server is not called. But this is not essential. Will move it to the top.

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franciscojavierarceo reviewed Mar 16, 2026
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overall this lgtm with two minor nits, thanks for doing this!

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@Anarion-zuo
Anarion-zuo force-pushed the aaronzuo/mcp_http_config branch from 3ee0133 to 36f1bdf Compare March 17, 2026 08:24
@Anarion-zuo

Anarion-zuo commented Mar 17, 2026

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Resolved your comments. @franciscojavierarceo

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@Anarion-zuo

Anarion-zuo commented Mar 17, 2026

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@franciscojavierarceo Perhaps we can merge this one?

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@franciscojavierarceo
franciscojavierarceo requested a review from YassinNouh21 March 17, 2026 14:25
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franciscojavierarceo approved these changes Mar 17, 2026
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this lgtm, let's wait for @YassinNouh21 to review

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YassinNouh21
YassinNouh21 reviewed Mar 17, 2026
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Comment thread sdk/python/feast/feature_server.py Outdated
)

mcp_transport_not_supported_error = McpTransportNotSupportedError
except Exception as e:

@YassinNouh21 YassinNouh21 Mar 17, 2026 •
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except Exception here catches SyntaxError, AttributeError, etc. — not just a missing package. Use except ImportError so real bugs in mcp_server.py are not silently swallowed. @franciscojavierarceo worth fixing before merge.

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@YassinNouh21 YassinNouh21 Mar 17, 2026

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cc: @franciscojavierarceo

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YassinNouh21
YassinNouh21 reviewed Mar 17, 2026
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Comment thread sdk/python/feast/infra/mcp_servers/mcp_server.py Outdated
# Mount the MCP server to the FastAPI app
mcp.mount()
transport: Literal["sse", "http"] = (
getattr(config, "mcp_transport", "sse") or "sse"

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or "sse" handles None but mcp_transport is now Literal["sse", "http"] so None is impossible. Can simplify to getattr(config, "mcp_transport", "sse").

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YassinNouh21
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Comment thread sdk/python/feast/infra/mcp_servers/mcp_server.py Resolved

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Comment thread sdk/python/feast/infra/mcp_servers/mcp_server.py
else:
mcp.mount()
else:
raise McpTransportNotSupportedError(

@YassinNouh21 YassinNouh21 Mar 17, 2026

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This branch is unreachable — Literal["sse", "http"] in the config rejects anything else at parse time. Either remove it or add a comment that it's a defensive guard for programmatic callers.

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@YassinNouh21 YassinNouh21 Mar 17, 2026

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@Anarion-zuo u didn't solve it btw :)

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@franciscojavierarceo franciscojavierarceo Mar 25, 2026

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@Anarion-zuo any update on this one?

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@Anarion-zuo Anarion-zuo Mar 25, 2026

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Sorry. Missed this one. Will look at it ASAP.

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@Anarion-zuo Anarion-zuo Mar 27, 2026

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@YassinNouh21 Made some changes. Is this aligned with what you intended?

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YassinNouh21
YassinNouh21 reviewed Mar 17, 2026
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Comment thread sdk/python/feast/infra/mcp_servers/mcp_server.py Outdated
except McpTransportNotSupportedError:
raise
except Exception as e:
logger.error(f"Failed to initialize MCP integration: {e}")

@YassinNouh21 YassinNouh21 Mar 17, 2026

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Missing exc_info=True — loses the traceback. Without it, debugging a broken init means guessing from just the exception message string.

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YassinNouh21
YassinNouh21 reviewed Mar 17, 2026
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Comment thread .github/workflows/pr_integration_tests.yml Outdated
-H "Content-Type: application/json" \
-H "mcp-protocol-version: 2025-03-26" \
--data '{}' \
http://127.0.0.1:6566/mcp || true

@YassinNouh21 YassinNouh21 Mar 17, 2026

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|| true swallows connection failures. If the server crashed or is unreachable, curl exits non-zero but the step continues and later grep on a missing/empty file gives a confusing error. Remove || true and let curl fail the step directly.

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YassinNouh21 reviewed Mar 17, 2026
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Comment thread .github/workflows/pr_integration_tests.yml Resolved

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@Anarion-zuo
Anarion-zuo force-pushed the aaronzuo/mcp_http_config branch from 7d4360c to 0c897c6 Compare March 17, 2026 15:38
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@Anarion-zuo

Anarion-zuo commented Mar 17, 2026

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Addressed all of the reviews. Waiting for CI to go green.

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Anarion-zuo commented Mar 18, 2026

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@franciscojavierarceo @YassinNouh21 It's green now.

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@Anarion-zuo

Anarion-zuo commented Mar 21, 2026

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@franciscojavierarceo @YassinNouh21 gentle ping

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@YassinNouh21

YassinNouh21 commented Mar 30, 2026

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@Anarion-zuo gentle bump — verified the latest push and these 3 are still unresolved:

  1. mcp_server.py:51 — drop the redundant or "sse" (type is Literal["sse","http"], can't be None)
  2. mcp_server.py:68-70 — remove the unreachable else branch or add a # defensive guard for programmatic callers comment
  3. pr_integration_tests.yml:163 — remove || true on the second curl; -sS already exits 0 on HTTP 4xx, so it only masks connection failures
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Anarion-zuo commented Apr 1, 2026

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@YassinNouh21 pushed some code yesterday. Please review.

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Anarion-zuo commented Apr 4, 2026

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@YassinNouh21 @franciscojavierarceo gentle ping

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YassinNouh21 approved these changes Apr 5, 2026
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LGTM

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Anarion-zuo added 2 commits April 5, 2026 20:22
@Anarion-zuo @ntkathole
feat: Support HTTP in MCP
fc7974c
Signed-off-by: aaronzuo <[email protected]>
@Anarion-zuo @ntkathole
dev
3b517b2
Signed-off-by: aaronzuo <[email protected]>
Anarion-zuo added 11 commits April 5, 2026 20:22
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format
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fix
2725f43
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fix
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fix
26a01a2
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dev
d0c2832
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fix
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fix reviews
face1ed
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fix logger
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fix logger test
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fix comment
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resolve comments
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@ntkathole
ntkathole force-pushed the aaronzuo/mcp_http_config branch from da3aacf to ea6358f Compare April 5, 2026 14:52
@ntkathole ntkathole added the ok-to-test label Apr 5, 2026
@ntkathole
ntkathole merged commit e72b983 into feast-dev:master Apr 5, 2026
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franciscojavierarceo pushed a commit that referenced this pull request Apr 7, 2026
@feast-ci-bot
chore(release): release 0.61.0
b374396
# [0.61.0](v0.60.0...v0.61.0) (2026-04-07)

### Bug Fixes

* Add grpcio dependency group to transformation server Dockerfile ([2c2150a](2c2150a))
* Add https readiness check for rest-registry tests ([ea85e63](ea85e63))
* Add website build check for PRs and fix blog frontmatter YAML error ([#6079](#6079)) ([30a3a43](30a3a43))
* Added missing jackc/pgx/v5 entries ([94ad0e7](94ad0e7))
* Added MLflow metric charts across feature selection ([#6080](#6080)) ([a403361](a403361))
* Check duplicate names for feature view across types ([#5999](#5999)) ([95b9af8](95b9af8))
* Fix integration tests ([#6046](#6046)) ([02d5548](02d5548))
* Fix missing error handling for resource_counts endpoint ([d9706ce](d9706ce))
* Fix non-specific label selector on metrics service ([a1a160d](a1a160d))
* fix path feature_definitions.py ([7d7df68](7d7df68))
* Fix regstry Rest API tests intermittent failure ([d53a339](d53a339))
* Fixed IntegrityError on SqlRegistry ([#6047](#6047)) ([325e148](325e148))
* Fixed intermittent failures in get_historical_features ([c335ec7](c335ec7))
* Fixed pre-commit check ([114b7db](114b7db))
* Fixed the intermittent FeatureViewNotFoundException ([661ecc7](661ecc7))
* Fixed uv cache permission error for docker build on mac ([ad807be](ad807be))
* Fixes a `PydanticDeprecatedSince20` warning for trino_offline_store ([#5991](#5991)) ([abfd18a](abfd18a))
* Handle existing RBAC role gracefully in namespace registry ([b46a62b](b46a62b))
* Ignore ipynb files during apply ([#6151](#6151)) ([4ea123d](4ea123d))
* Integration test failures ([#6040](#6040)) ([9165870](9165870))
* Mount TLS volumes for init container ([080a9b5](080a9b5))
* **postgres:** Use end_date in synthetic entity_df for non-entity retrieval ([#6110](#6110)) ([088a802](088a802)), closes [#6066](#6066)
* Ray offline store tests are duplicated across 3 workflows ([54f705a](54f705a))
* Reenable tests ([#6036](#6036)) ([82ee7f8](82ee7f8))
* SSL/TLS mode by default for postgres connection ([4844488](4844488))
* Use commitlint pre-commit hook instead of a separate action ([35a81e7](35a81e7))

### Features

* Add Claude Code agent skills for Feast ([#6081](#6081)) ([1e5b60f](1e5b60f)), closes [#5976](#5976) [#6007](#6007)
* Add complex type support (Map, JSON, Struct) with schema validation ([#5974](#5974)) ([1200dbf](1200dbf))
* Add decimal to supported feature types ([#6029](#6029)) ([#6226](#6226)) ([cff6fbf](cff6fbf))
* Add feast apply init container to automate registry population on pod start ([#6106](#6106)) ([6b31a43](6b31a43))
* Add feature view versioning support to PostgreSQL and MySQL online stores ([#6193](#6193)) ([940e0f0](940e0f0)), closes [#6168](#6168) [#6169](#6169) [#2728](#2728)
* Add materialization, feature freshness, request latency, and push metrics to feature server ([2c6be18](2c6be18))
* Add metadata statistics to registry api ([ef1d4fc](ef1d4fc))
* Add non-entity retrieval support for ClickHouse offline store ([4d08ddc](4d08ddc)), closes [#5835](#5835)
* Add OnlineStore for MongoDB ([#6025](#6025)) ([bf4e3fa](bf4e3fa)), closes [golang/go#74462](golang/go#74462)
* Add Oracle DB as Offline store in python sdk & operator ([#6017](#6017)) ([9d35368](9d35368))
* Add RBAC aggregation labels to FeatureStore ClusterRoles ([daf77c6](daf77c6))
* Add ServiceMonitor auto-generation for Prometheus discovery ([#6126](#6126)) ([56e6d21](56e6d21))
* Add typed_features field to grpc write request (([#6117](#6117)) ([#6118](#6118)) ([eeaa6db](eeaa6db)), closes [#6116](#6116)
* Add UUID and TIME_UUID as feature types ([#5885](#5885)) ([#5951](#5951)) ([5d6e311](5d6e311))
* Add version indicators to lineage graph nodes ([#6187](#6187)) ([73805d3](73805d3))
* Add version tracking to FeatureView ([#6101](#6101)) ([ed4a4f2](ed4a4f2))
* Added Agent skills for AI Agents ([#6007](#6007)) ([99008c8](99008c8))
* Added CodeQL SAST scanning and detect-secrets pre-commit hook ([547b516](547b516))
* Added odfv transformations metrics ([8b5a526](8b5a526))
* Adding optional name to Aggregation (feast-dev[#5994](#5994)) ([#6083](#6083)) ([56469f7](56469f7))
* Created DocEmbedder class ([#5973](#5973)) ([0719c06](0719c06))
* Extended OIDC support to extract groups & namespaces and token injection with multiple methods ([#6089](#6089)) ([7c04026](7c04026))
* Feature Server High-Availability on Kubernetes ([#6028](#6028)) ([9c07b4c](9c07b4c)), closes [Hi#Availability](https://github.com/Hi/issues/Availability) [Hi#Availability](https://github.com/Hi/issues/Availability)
* **go:** Implement metrics and tracing for http and grpc servers ([#5925](#5925)) ([2b4ec9a](2b4ec9a))
* Horizontal scaling support to the Feast operator ([#6000](#6000)) ([3ec13e6](3ec13e6))
* Making feature view source optional (feast-dev[#6074](#6074)) ([#6075](#6075)) ([76917b7](76917b7))
* Replace ORJSONResponse with Pydantic response models for faster JSON serialization ([65cf03c](65cf03c))
* Support arm docker build ([#6061](#6061)) ([1e1f5d9](1e1f5d9))
* Support distinct count aggregation [[#6116](#6116)] ([3639570](3639570))
* Support HTTP in MCP ([#6109](#6109)) ([e72b983](e72b983))
* Support nested collection types (Array/Set of Array/Set) ([#5947](#5947)) ([#6132](#6132)) ([ab61642](ab61642))
* Support podAnnotations on Deployment pod template ([1b3cdc1](1b3cdc1))
* Use orjson for faster JSON serialization in feature server ([6f5203a](6f5203a))
* Utilize date partition column in BigQuery ([#6076](#6076)) ([4ea9b32](4ea9b32))

### Performance Improvements

* Online feature response construction in a single pass over read rows ([113fb04](113fb04))
* Optimize protobuf parsing in Redis online store ([#6023](#6023)) ([59dfdb8](59dfdb8))
* Optimize timestamp conversion in _convert_rows_to_protobuf ([33a2e95](33a2e95))
* Parallelize DynamoDB batch reads in sync online_read ([#6024](#6024)) ([9699944](9699944))
* Remove redundant entity key serialization in online_read ([d87283f](d87283f))
franciscojavierarceo pushed a commit that referenced this pull request Apr 8, 2026
@feast-ci-bot
chore(release): release 0.62.0
beaa9a6
# [0.62.0](v0.61.0...v0.62.0) (2026-04-08)

### Bug Fixes

* Added missing jackc/pgx/v5 entries ([94ad0e7](94ad0e7))
* Fix missing error handling for resource_counts endpoint ([d9706ce](d9706ce))
* fix path feature_definitions.py ([7d7df68](7d7df68))
* Fix regstry Rest API tests intermittent failure ([d53a339](d53a339))
* Fixed intermittent failures in get_historical_features ([c335ec7](c335ec7))
* Fixed the intermittent FeatureViewNotFoundException ([661ecc7](661ecc7))
* Handle existing RBAC role gracefully in namespace registry ([b46a62b](b46a62b))
* Ignore ipynb files during apply ([#6151](#6151)) ([4ea123d](4ea123d))
* Mount TLS volumes for init container ([080a9b5](080a9b5))
* **postgres:** Use end_date in synthetic entity_df for non-entity retrieval ([#6110](#6110)) ([088a802](088a802)), closes [#6066](#6066)
* SSL/TLS mode by default for postgres connection ([4844488](4844488))
* Sync v0.61-branch so v0.61.0 tag is reachable from master ([af66878](af66878))

### Features

* Add Claude Code agent skills for Feast ([#6081](#6081)) ([1e5b60f](1e5b60f)), closes [#5976](#5976) [#6007](#6007)
* Add decimal to supported feature types ([#6029](#6029)) ([#6226](#6226)) ([cff6fbf](cff6fbf))
* Add feast apply init container to automate registry population on pod start ([#6106](#6106)) ([6b31a43](6b31a43))
* Add feature view versioning support to PostgreSQL and MySQL online stores ([#6193](#6193)) ([940e0f0](940e0f0)), closes [#6168](#6168) [#6169](#6169) [#2728](#2728)
* Add metadata statistics to registry api ([ef1d4fc](ef1d4fc))
* Add Oracle DB as Offline store in python sdk & operator ([#6017](#6017)) ([9d35368](9d35368))
* Add RBAC aggregation labels to FeatureStore ClusterRoles ([daf77c6](daf77c6))
* Add ServiceMonitor auto-generation for Prometheus discovery ([#6126](#6126)) ([56e6d21](56e6d21))
* Add typed_features field to grpc write request (([#6117](#6117)) ([#6118](#6118)) ([eeaa6db](eeaa6db)), closes [#6116](#6116)
* Add UUID and TIME_UUID as feature types ([#5885](#5885)) ([#5951](#5951)) ([5d6e311](5d6e311))
* Add version indicators to lineage graph nodes ([#6187](#6187)) ([73805d3](73805d3))
* Add version tracking to FeatureView ([#6101](#6101)) ([ed4a4f2](ed4a4f2))
* Added Agent skills for AI Agents ([#6007](#6007)) ([99008c8](99008c8))
* Added odfv transformations metrics ([8b5a526](8b5a526))
* Created DocEmbedder class ([#5973](#5973)) ([0719c06](0719c06))
* Extended OIDC support to extract groups & namespaces and token injection with multiple methods ([#6089](#6089)) ([7c04026](7c04026))
* Replace ORJSONResponse with Pydantic response models for faster JSON serialization ([65cf03c](65cf03c))
* Support distinct count aggregation [[#6116](#6116)] ([3639570](3639570))
* Support HTTP in MCP ([#6109](#6109)) ([e72b983](e72b983))
* Support nested collection types (Array/Set of Array/Set) ([#5947](#5947)) ([#6132](#6132)) ([ab61642](ab61642))
* Support podAnnotations on Deployment pod template ([1b3cdc1](1b3cdc1))
* Utilize date partition column in BigQuery ([#6076](#6076)) ([4ea9b32](4ea9b32))

### Performance Improvements

* Online feature response construction in a single pass over read rows ([113fb04](113fb04))
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@franciscojavierarceo franciscojavierarceo franciscojavierarceo approved these changes
@devin-ai-integration devin-ai-integration[bot] devin-ai-integration[bot] left review comments
+1 more reviewer
@YassinNouh21 YassinNouh21 YassinNouh21 approved these changes
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@Anarion-zuo @YassinNouh21 @franciscojavierarceo @ntkathole
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