[patch] Add warn logging messages to agent-sidecar & ignore io.EOF error when reading metadata.json

[rinx]

Signed-off-by: Rintaro Okamura rintaro.okamura@gmail.com

Description:

Currently, this PR is just for debugging.
Do not merge.

Related Issue:

Nothing.

How Has This Been Tested?:

Nothing.

Environment:

• Go Version: 1.14.4
• Docker Version: 19.03.8
• Kubernetes Version: 1.18.2
• NGT Version: 1.12.0

Types of changes:

• Bug fix [type/bug]
• New feature [type/feature]
• Add tests [type/test]
• Security related changes [type/security]
• Add documents [type/documentation]
• Refactoring [type/refactoring]
• Update dependencies [type/dependency]
• Update benchmarks and performances [type/bench]
• Update CI [type/ci]

Changes to Core Features:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your core changes, as applicable?
• Have you successfully ran tests with your changes locally?

Checklist:

• I have read the CONTRIBUTING document.
• I have checked open Pull Requests for the similar feature or fixes?
• I have added tests and benchmarks to cover my changes.
• I have ensured all new and existing tests passed.
• I have commented my code, particularly in hard-to-understand areas
• I have updated the documentation accordingly.

[pull-assistant]

Best reviewed: commit by commit

---

Optimal code review plan

     🔊 Add debug log for agent-sidecar

     🔊 add error logs to metadata.go

     ♻️ add err != io.EOF to internal/metadata

     🔊 print err

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[vdaas-ci]

[CHATOPS:HELP] ChatOps commands.

• 🙆‍♀️ /approve - approve
• 💌 /changelog - add changelog comment
• 🍱 /format - format codes and add licenses
• ✅ /gen-test - generate test codes
• 🏷️ /label - add labels
• ⏪ /rebase - rebase master

[codecov]

Codecov Report

Merging #608 into master will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #608      +/-   ##
==========================================
- Coverage   12.13%   12.13%   -0.01%     
==========================================
  Files         409      409              
  Lines       21325    21329       +4     
==========================================
  Hits         2588     2588              
- Misses      18452    18456       +4     
  Partials      285      285              

Impacted Files	Coverage Δ
pkg/agent/sidecar/service/observer/observer.go	0.00% <0.00%> (ø)

---

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[rinx]

/rebase
/format

[vdaas-ci]

[REBASE] Rebase triggered by rinx for branch: refactor/agent-sidecar/add-debug-logs

[vdaas-ci]

[FORMAT] Updating license headers and formatting go codes triggered by rinx.

[kpango]

/rebase
/format
/changelog
/approve

[vdaas-ci]

[CHANGELOG] Please edit the following lines.

• Add warn logging messages to agent-sidecar & ignore io.EOF error when reading metadata.json (#608)
• Add DB metrics: Cassandra (#587)
• ♻️ Improve Singleflight performance (#580)
• 📝 add delete dataflow in architecture document (#591)
• ♻️ Add gaussian random vector generation (#595)
• ♻️ ✅ Refactoring internal/db/kvs/redis package (#590)
• 💚 Add reviewdog - markdown: LanguageTool (#604)
• 💚 Add reviewdog - hadolint (#603)
• 🤖 Automatically update k8s manifests (#599)

[vdaas-ci]

[REBASE] Rebase triggered by kpango for branch: refactor/agent-sidecar/add-debug-logs

[vdaas-ci]

[FORMAT] Updating license headers and formatting go codes triggered by kpango.

[vdaas-ci]

[APPROVED] This PR is approved by kpango.