sejal-gupta-ksolves opened a new pull request, #16725:
URL: https://github.com/apache/iceberg/pull/16725
### Closes: #14227
### Problem
The `iceberg-rest-fixture` image runs without an explicit logging
configuration, causing `slf4j-simple` to default to `INFO`. This floods the
container console with operational logs during routine REST API calls, making
it difficult to spot actual warnings or errors.
### Solution
1. Added a `simplelogger.properties` configuration file under
`docker/iceberg-rest-fixture/`.
2. Set the default threshold to `INFO` to preserve existing baseline
behavior out of the box.
3. Updated the `Dockerfile` to copy this file onto the execution classpath.
4. Wrapped the `Dockerfile` `CMD` layer in a shell script invocation (`sh
-c`) to dynamically evaluate custom runtime environment variables.
### Logging Switch Mechanism
Users can natively switch or completely turn off `INFO` logs at runtime via
the `LOG_LEVEL` environment variable:
* **Default Behavior (As-Is):**
```bash
docker run -d -p 8181:8181 local/iceberg-rest-fixture:test
### Verification Testing
```bash
# 1. Build the distribution JAR
./gradlew :iceberg-open-api:build -x test
# 2. Build the Docker image from root context
docker build -t local/iceberg-rest-fixture:test -f
docker/iceberg-rest-fixture/Dockerfile .
# 3. Verify Default Mode (Should output INFO logs)
docker run -d --name test-info -p 8181:8181 local/iceberg-rest-fixture:test
curl http://localhost:8181/v1/config
docker logs test-info
docker rm -f test-info
# 4. Verify Toggle Mode (Should stay clean of INFO logs)
docker run -d --name test-warn -e LOG_LEVEL=WARN -p 8181:8181
local/iceberg-rest-fixture:test
curl http://localhost:8181/v1/config
docker logs test-warn
docker rm -f test-warn
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