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WalkthroughIntegrates Prometheus JMX exporter into the ActiveMQ Docker image: adds agent JAR download with checksum, adds Changes
Sequence Diagram(s)sequenceDiagram
autonumber
participant Builder as Build stage
participant Image as Docker image (final)
participant Init as Container init/start
participant JVM as ActiveMQ JVM
participant JMX as jmx_prometheus_javaagent
participant Health as healthcheck.sh
rect rgb(230, 245, 255)
Builder->>Image: ADD jmx_prometheus_javaagent.jar (with checksum)\nCOPY jmx.yml\nSet ENV JMX_OPT
end
rect rgb(245, 250, 230)
Init->>Image: container start
Init->>JVM: launch JVM with ACTIVEMQ_OPTS (includes $JMX_OPT)
JVM->>JMX: attach javaagent on port 3001
JMX-->>JVM: expose metrics endpoint :3001/metrics
end
rect rgb(255, 243, 230)
Health->>Image: run healthcheck.sh
Health->>Health: strip $JMX_OPT from ACTIVEMQ_OPTS
Health->>JVM: perform probe (HTTP/management endpoint)
JVM-->>Health: return health status
end
Estimated code review effort🎯 3 (Moderate) | ⏱️ ~25 minutes
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Pre-merge checks and finishing touches❌ Failed checks (1 inconclusive)
✅ Passed checks (2 passed)
✨ Finishing touches🧪 Generate unit tests (beta)
Warning Review ran into problems🔥 ProblemsErrors were encountered while retrieving linked issues. Errors (1)
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Alexander-Cairns
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Actionable comments posted: 2
Caution
Some comments are outside the diff and can’t be posted inline due to platform limitations.
⚠️ Outside diff range comments (1)
Dockerfile (1)
10-10: Port 3001 (JMX metrics) is not exposed.The JMX exporter is configured to run on port 3001 (line 46) but the EXPOSE statement does not include it. Metrics will be unreachable from outside the container.
Add port 3001 to the EXPOSE statement:
-EXPOSE 8161 61613 61616 +EXPOSE 8161 61613 61616 3001
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📒 Files selected for processing (3)
Dockerfile(1 hunks)healthcheck.sh(1 hunks)jmx.yml(1 hunks)
🧰 Additional context used
🪛 Shellcheck (0.11.0)
healthcheck.sh
[warning] 4-4: In POSIX sh, string replacement is undefined.
(SC3060)
⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (1)
- GitHub Check: build / build-push
🔇 Additional comments (2)
jmx.yml (1)
1-36: Verify jmx_exporter configuration against actual ActiveMQ MBean names.The configuration looks structurally sound for Prometheus JMX exporter, but the regex patterns should be validated against actual ActiveMQ broker MBean attribute names to ensure they correctly match and extract metrics.
To verify the patterns work correctly, confirm:
- ActiveMQ broker exposes MBeans matching
org.apache.activemq:type=Broker,brokerName=*- Queue/topic destination names match the pattern separators (spaces after commas in line 12, 18)
- The
valueFactor: 0.01correctly converts percent usage to 0–1 rangeIf you have access to a running ActiveMQ instance, you can verify the MBean names by inspecting JMX metrics. Alternatively, consult the jmx_prometheus_exporter documentation to confirm the pattern syntax (particularly the angle bracket format
<type=Broker, ...><>on lines 12, 18, etc.).Dockerfile (1)
35-43: Based on my verification:Update Dockerfile to use the latest JMX exporter version 1.5.0 and verify the digest.
Version 1.4.0 was released Aug 25, 2025, but version 1.5.0 (published Oct 7, 2025) is the latest release. While 1.4.0 is technically valid, using an outdated version introduces maintenance risk. GitHub Release page hosts the JARs (collector jar no longer published to Maven Central).
Manually verify the SHA256 digest
db1492e95a7ee95cd5e0a969875c0d4f0ef6413148d750351a41cc71d775f59amatches the official GitHub release artifact for version 1.4.0 before proceeding.
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Actionable comments posted: 1
♻️ Duplicate comments (1)
Dockerfile (1)
47-47: ACTIVEMQ_OPTS overwrite loses pre-existing environment settings.Line 47 sets
ENV ACTIVEMQ_OPTS="${JMX_OPT}"which overwrites any pre-existingACTIVEMQ_OPTSvalue (e.g., from the base image or previous layers). This should append to the existing value instead.Apply this diff to preserve existing options:
-ENV ACTIVEMQ_OPTS="${JMX_OPT}" +ENV ACTIVEMQ_OPTS="${ACTIVEMQ_OPTS:-} ${JMX_OPT}"
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📒 Files selected for processing (1)
Dockerfile(1 hunks)
| # renovate: datasource=github-release-attachments depName=prometheus/jmx_exporter | ||
| ARG JMX_EXPORTER_VERSION=1.4.0 | ||
| ARG JMX_EXPORTER_DIGEST=sha256:db1492e95a7ee95cd5e0a969875c0d4f0ef6413148d750351a41cc71d775f59a | ||
| WORKDIR /jmx | ||
| ADD \ | ||
| --link \ | ||
| --chmod=644 \ | ||
| --checksum=$JMX_EXPORTER_DIGEST \ | ||
| https://github.com/prometheus/jmx_exporter/releases/download/$JMX_EXPORTER_VERSION/jmx_prometheus_javaagent-$JMX_EXPORTER_VERSION.jar jmx_prometheus_javaagent.jar | ||
| COPY --chmod=644 jmx.yml ./ |
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❓ Verification inconclusive
Solid security practices with checksummed artifact download.
The renovate comment, ARG declarations with SHA256 digest, and ADD command with --checksum verification provide strong supply-chain security. Permissions are properly set, and the working directory restructuring is clean.
Please verify that your Docker build environment supports the --link flag (Docker 23.0+). If using an earlier version, this build will fail. Run the following to confirm:
🏁 Script executed:
#!/bin/bash
# Check Docker version
docker --versionLength of output: 44
The web search reveals an important correction: the --link flag in Dockerfile (used in ADD/COPY commands) requires Dockerfile syntax version to be at least 1.4, not Docker version 23.0+. Add # syntax=docker/dockerfile:1.4 to the top of your Dockerfile to enable the --link flag.
The code snippet provided does not show a syntax declaration at the beginning of the Dockerfile. This is a critical issue that needs to be addressed.
Add Dockerfile syntax declaration for --link flag support.
The Dockerfile uses --link in the ADD command (line 40) but lacks the required syntax directive. To use the --link flag set Dockerfile version to at least 1.4 by adding # syntax=docker/dockerfile:1.4 to the top of the file.
🤖 Prompt for AI Agents
In Dockerfile around lines 35 to 44, the ADD uses the --link flag but the file
lacks the required Dockerfile syntax directive; add a syntax declaration as the
very first line of the Dockerfile such as specifying the Dockerfile frontend
version (e.g. # syntax=docker/dockerfile:1.4 or a newer compatible tag) so the
--link flag is recognized, then keep the rest of the file unchanged.
|
Tag generated by PR: v1.3.0 |
2 participants
Summary by CodeRabbit
New Features
Bug Fixes
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