docs(integration): Cortex, Flux, Vitess, rclone, JuiceFS, Nextcloud, Airflow, Kafka, Delta Lake, GreptimeDB, VictoriaMetrics, OpenSearch, Envoy, vLLM, tusd guides + Cloud Native category

[majinghe]

Summary

Twelve new RustFS integration guides in all five locales (en/zh/de/fr/ja), each verified end-to-end against RustFS v2.3.1 before writing:

Batch 1 — ten guides:

• cloud-native/cortex.md, cloud-native/flux.md + new Cloud Native category
• big-data/vitess.md — S3 backup storage, GetBackups read-back
• big-data/airflow.md — S3Hook / S3CreateObjectOperator / S3KeySensor DAG, all tasks succeed
• big-data/kafka.md — Kafka 4.0 + Confluent S3 sink 10.5.25, batched objects byte-exact in bucket
• big-data/delta-lake.md — delta-rs write/read, _delta_log verified
• observability/greptimedb.md — S3 storage backend, Parquet SST + manifests in bucket
• observability/victoriametrics.md — vmbackup/vmrestore round-trip
• devops/opensearch.md — repository-s3 snapshot + delete/restore of an index
• reverse-proxy/envoy.md — TLS virtual hosts + signed S3 passthrough

Batch 2 — two guides:

• ai/vllm.md — vLLM 0.30.0 CPU serving facebook/opt-125m with weights stored in a RustFS bucket, exposed to the server through an rclone FUSE mount; OpenAI-compatible completion verified. Documents why the native s3:// loader path is not used (RunAI streamer ranged reads fail against custom endpoints) and the verified mount-based pattern instead.
• others/tusd.md — tusd v2.10.1 with S3 backend on RustFS: tus protocol create/PATCH/HEAD resume flow, final object sha1-identical to the source file.

All category indexes, meta.json navigation, and the integration landing page are updated in all locales. Screenshots: zh-locale console shots in zh docs, English shots in en/de/fr/ja.

Notes

• Kafka / KIP-405: Apache Kafka ships only the RemoteLogStorageManager SPI with no open-source S3 implementation; the guide documents the open Connect S3 sink path.
• vLLM: replaced the earlier skip — verified on the official CPU image via the mount pattern. The native s3:// loading path (RunAI streamer C++) fails ranged reads against custom endpoints; documented as a note rather than a broken guide.
• Real pitfalls captured per guide: Envoy key permissions and host:* domains; OpenSearch keystore-only credentials and server_side_encryption_type: bucket_default; Kafka 4.0 advertised listener and the connect.converters package move; tusd requires AWS_REGION and echoes Host in Location URLs; vLLM CPU memory-fraction and shm sizing; delta-rs AWS_S3_ALLOW_UNSAFE_RENAME; and more.

Validation

• audit-locales.mjs — only expected de/fr/ja English-copy notices plus known SOURCE_LOCALE_LINK external-URL false positives (docs.vllm.ai/en, docs.ray.io/en, elastic.co/guide/en); no real violations on new files.
• npm run docs:check — OK (7/7 checks).
• npm run build — OK (3475 files generated).
• All twelve integrations verified on a live RustFS v2.3.1 instance.

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