TN-017 — Reconcile Tomcat Server Metric Name Contract

Field	Value
Status	Completed
Activity Type	Implementation
Record Type	Live
Project	Tomcat Monitoring
Phase	Monitoring Integration and Runtime Deployment
Activity Date	2026-08-25
Recorded Date	2026-08-25
Owner	Project owner
Working Mode	Write
Authorization Status	Approved
Approved By	Project owner
Approval Date	2026-08-25

🎯 Objective

Menyelaraskan JMX Exporter source contract, static validator, dan documentation dengan canonical runtime metric name tomcat_server yang dibuktikan TN-016.

🌍 Background

TN-016 memverifikasi bahwa rule bernama tomcat_server_info menghasilkan runtime series tomcat_server. Upstream JMX Exporter mengklasifikasikan penghapusan suffix _info sebagai working-as-designed behavior, sedangkan Prometheus client naming contract menyatakan _info merupakan reserved suffix yang dihapus dari base metric name saat sanitization.

Project owner menerima tomcat_server sebagai canonical runtime contract dan menyetujui source-only reconciliation pada 2026-08-25.

📚 Scope

• Ubah JMX Exporter baseline rule dari tomcat_server_info menjadi tomcat_server.
• Selaraskan static validator dan component README.
• Tutup Open Question TN-016 secara append-oriented dan konsolidasikan current-state documentation.
• Jalankan shell syntax, component dan repository validators, whitespace, diff, navigation, serta documentation checks.

Container, volume, TLS material, runtime verification baru, dependency, image build, cleanup runtime, dan commit tidak termasuk scope. TN-014 serta TN-015 dipertahankan sebagai historical records.

📋 Prerequisites

Prerequisite	Expected state	Initial result
Runtime evidence	TN-016 membuktikan actual series tomcat_server.	Passed.
Decision	Project owner menerima tomcat_server sebagai canonical contract.	Passed on 2026-08-25.
Source repository	tomcat-monitoring bersih sebelum implementation.	Passed.
Documentation repository	Hanya perubahan TN-016 yang terotorisasi tersedia.	Passed; changes dipertahankan.

⚖️ Execution Decision

Gunakan tomcat_server sebagai canonical source dan downstream metric name. Keputusan ini mengikuti observed runtime behavior serta upstream reserved-name sanitization dan menghindari contract yang tidak dapat dihasilkan oleh current JMX Exporter runtime.

🗺️ Implementation Plan

Tahap	Rencana
Register the Technical Note and Navigation	Membuat TN-017 dan memastikan urutannya dapat ditemukan.
Update the Canonical Metric Name	Mengubah exact metric name pada configuration, validator, dan component README.
Reconcile the Historical and Current-State Documentation	Mencatat resolution tanpa menulis ulang evidence TN-014 sampai TN-016.
Validate the Source and Documentation	Menjalankan pemeriksaan source serta dokumentasi dalam scope.
Consolidate the Closure Boundary	Menutup activity dan menyatakan hasil serta batas runtime berikutnya.

⚙️ Implementation

Register the Technical Note and Navigation

Pastikan TN-017 tersedia dan terdaftar setelah TN-016.

test -f docs/projects/tomcat-monitoring/engineering-journal/monitoring-integration-and-runtime-deployment/TN-017-reconcile-tomcat-server-metric-name-contract.md
rg -n 'TN-016|TN-017' docs/projects/tomcat-monitoring/engineering-journal/monitoring-integration-and-runtime-deployment/index.md docs/projects/tomcat-monitoring/engineering-journal/monitoring-integration-and-runtime-deployment/.pages

Expected Result

TN-016 dan TN-017 tersedia serta terdaftar berurutan.

Actual Result: file dan navigation entry tersedia.

Evidence: existence test dan reference review lulus.

Update the Canonical Metric Name

Ubah tomcat_server_info menjadi tomcat_server pada configuration, validator, dan component README tanpa mengubah pattern, label, value, atau type.

bash -n scripts/*.sh
./scripts/validate-jmx-exporter.sh
./scripts/validate.sh

Expected Result

Source menggunakan canonical name tomcat_server dan seluruh validator tetap lulus.

Actual Result: exact name diperbarui pada tiga file source dan validation tetap lulus.

Evidence: targeted diff serta pencarian kedua nama metric.

Reconcile the Historical and Current-State Documentation

1. Tambahkan resolution append-oriented pada TN-016.
2. Perbarui halaman current-state yang sebelumnya menampilkan mismatch.
3. Pertahankan TN-014 dan TN-015 sebagai historical decision serta evidence.

Expected Result

Current state memakai canonical name, sedangkan histori lama tetap dapat ditelusuri dan tidak ditulis ulang.

Actual Result: resolution ditambahkan pada TN-016 dan current-state pages diselaraskan; TN-014 serta TN-015 tetap mempertahankan konteks awal.

Evidence: targeted reference review pada journal dan current-state pages.

Validate the Source and Documentation

git diff --check
rg -n '[[:blank:]]+$' config/jmx-exporter/jmx-exporter.yml config/jmx-exporter/README.md scripts/validate-jmx-exporter.sh

Expected Result

Source dan dokumentasi bebas syntax serta whitespace error dan perubahan tetap berada dalam scope.

Actual Result: source validators, diff checks, dan trailing-whitespace checks lulus; MkDocs tidak tersedia.

Evidence: command record dan tabel Verification.

Consolidate the Closure Boundary

Catat outcome, residual boundary, dan next step tanpa memperluas klaim ke runtime atau image mutation.

Expected Result

Pembaca memahami bahwa source contract selesai tetapi runtime berikutnya tetap memerlukan activity terpisah.

Actual Result: Outcome dan Next Steps membedakan source reconciliation dari runtime verification.

Evidence: closure sections dan Verification menyatakan tidak ada Podman, build, TLS, atau cleanup command pada TN-017.

⚙️ Commands Executed

Readiness and decision discovery

git -C /home/eddywiyatno/git/tomcat-monitoring status --short --branch
git -C /home/eddywiyatno/git/devops-handbook status --short --branch
rg -n 'tomcat_server_info|tomcat_server|two-rule|baseline metric' /home/eddywiyatno/git/tomcat-monitoring /home/eddywiyatno/git/devops-handbook/docs/projects/tomcat-monitoring --glob '!engineering-journal/**'
sed -n '1,280p' /home/eddywiyatno/git/tomcat-monitoring/scripts/validate-jmx-exporter.sh
sed -n '1,180p' /home/eddywiyatno/git/tomcat-monitoring/config/jmx-exporter/jmx-exporter.yml
sed -n '1,200p' /home/eddywiyatno/git/tomcat-monitoring/config/jmx-exporter/README.md

Source repository bersih. Handbook hanya memiliki authorized TN-016 journal, navigation, dan current-state changes. Exact source references berada pada configuration, validator, dan component README.

Source validation and review

bash -n scripts/*.sh
./scripts/validate-jmx-exporter.sh
./scripts/validate.sh
git diff --check
rg -n '[[:blank:]]+$' config/jmx-exporter/jmx-exporter.yml config/jmx-exporter/README.md scripts/validate-jmx-exporter.sh
rg -n 'tomcat_server_info|tomcat_server' config/jmx-exporter/jmx-exporter.yml config/jmx-exporter/README.md scripts/validate-jmx-exporter.sh
git diff -- config/jmx-exporter/jmx-exporter.yml config/jmx-exporter/README.md scripts/validate-jmx-exporter.sh
git status --short --branch

Shell syntax, component validator, dan repository baseline validator lulus. Diff serta trailing-whitespace checks bersih. Source diff berisi tepat tiga files dan mempertahankan TLS structure, dua-rule count, password reference, serta secret boundary.

Documentation validation and final review

git diff --check
rg -n '[[:blank:]]+$' docs/projects/tomcat-monitoring/index.md docs/projects/tomcat-monitoring/development/index.md docs/projects/tomcat-monitoring/infrastructure/index.md docs/projects/tomcat-monitoring/operations/index.md docs/projects/tomcat-monitoring/engineering-journal/monitoring-integration-and-runtime-deployment/.pages docs/projects/tomcat-monitoring/engineering-journal/monitoring-integration-and-runtime-deployment/index.md docs/projects/tomcat-monitoring/engineering-journal/monitoring-integration-and-runtime-deployment/TN-016-verify-isolated-jmx-exporter-tls-scrape-integration.md docs/projects/tomcat-monitoring/engineering-journal/monitoring-integration-and-runtime-deployment/TN-017-reconcile-tomcat-server-metric-name-contract.md
rg -n 'TN-016|TN-017|tomcat_server_info|tomcat_server|Resolution recorded by TN-017' docs/projects/tomcat-monitoring/index.md docs/projects/tomcat-monitoring/development/index.md docs/projects/tomcat-monitoring/operations/index.md docs/projects/tomcat-monitoring/engineering-journal/monitoring-integration-and-runtime-deployment/.pages docs/projects/tomcat-monitoring/engineering-journal/monitoring-integration-and-runtime-deployment/index.md docs/projects/tomcat-monitoring/engineering-journal/monitoring-integration-and-runtime-deployment/TN-016-verify-isolated-jmx-exporter-tls-scrape-integration.md docs/projects/tomcat-monitoring/engineering-journal/monitoring-integration-and-runtime-deployment/TN-017-reconcile-tomcat-server-metric-name-contract.md
test -f docs/projects/tomcat-monitoring/engineering-journal/monitoring-integration-and-runtime-deployment/TN-016-verify-isolated-jmx-exporter-tls-scrape-integration.md
test -f docs/projects/tomcat-monitoring/engineering-journal/monitoring-integration-and-runtime-deployment/TN-017-reconcile-tomcat-server-metric-name-contract.md
command -v mkdocs
git diff --stat
git status --short --branch

Handbook diff dan trailing-whitespace checks lulus. TN-016 serta TN-017 tersedia dan terdaftar berurutan pada navigation serta phase index. Historical expected name tetap berada pada TN-014, TN-015, dan TN-016 evidence; resolution dicatat pada TN-016 serta TN-017 tanpa menulis ulang evidence lama. MkDocs render berstatus Not verified karena executable tidak tersedia dan dependency tidak dipasang.

✅ Verification

Method	Expected result	Actual result	Evidence
Shell syntax	Seluruh scripts valid.	Passed.	bash -n scripts/*.sh.
Component validation	Exact canonical name dan two-rule TLS contract diterima.	Passed.	./scripts/validate-jmx-exporter.sh.
Repository validation	Seluruh component contracts tetap valid.	Passed.	./scripts/validate.sh.
Source scope	Hanya configuration, component validator, dan README berubah.	Passed.	Targeted diff dan Git status.
Historical boundary	TN-014, TN-015, dan TN-016 evidence tidak ditulis ulang.	Passed.	Targeted reference review; resolution ditambahkan secara append-oriented.
Documentation	Diff, whitespace, navigation, links, dan current-state boundary valid.	Passed kecuali MkDocs render tidak tersedia.	Handbook checks dan file existence tests.
Runtime boundary	Tidak ada runtime atau image mutation.	Passed by executed-command review.	Tidak ada Podman, build, TLS, atau cleanup command pada TN-017.

🔄 Source-Control Handoff

Canonical tomcat_server source contract disimpan pada commit repository tomcat-monitoring 9975139. Isolated TLS verification, metric-name reconciliation, navigation, dan current-state documentation disimpan pada commit Handbook aa2cbf9.

🧾 Outcome

Source contract, validator, dan documentation kini menggunakan tomcat_server sebagai canonical baseline metric name. Open Question TN-016 ditutup melalui accepted decision dan append-oriented resolution. Seluruh mandatory source-level verification lulus.

Tidak ada container, volume, TLS material, runtime test, dependency, image, atau external state yang diubah. Runtime behavior tidak diuji ulang karena berada di luar approved source-only scope; observed behavior tetap menggunakan evidence TN-016. Source dan documentation changes kemudian disimpan sesuai Source-Control Handoff.

⏭️ Next Steps

Persistent JMX scrape integration tetap memerlukan activity dan authorization terpisah.

🔗 Related Documentation

• TN-016 — Verify Isolated JMX Exporter TLS Scrape Integration
• TN-015 — Implement JMX Exporter Baseline Configuration and Validation
• Tomcat Monitoring
• JMX Exporter issue #982 — _info suffix is working as designed
• Prometheus client metric-name sanitization