[9.3](backport #49098) [Metricbeat] Bump elastic-agent-system-metrics for zswap and cgroups v2 CPU CFS data

[mergify]

Proposed commit message

Bumps the elastic-agent-system-metrics dependency to v0.14.3, v0.14.2 also included.

What's Changed

• Add Zswap Metrics by @orestisfl in Add Zswap Metrics elastic-agent-system-metrics#279
• PULL_REQUEST_TEMPLATE: Remove reference to non-existant CHANGELOG.md by @orestisfl in PULL_REQUEST_TEMPLATE: Remove reference to non-existant CHANGELOG.md elastic-agent-system-metrics#286
• fix: remove shared context timeout from matrix tests by @orestisfl in fix: remove shared context timeout from matrix tests elastic-agent-system-metrics#285
• Enable modernize linter and apply suggestions by @orestisfl in Enable modernize linter and apply suggestions elastic-agent-system-metrics#287
• Use json omitzero for struct-typed fields in cgroup structs by @orestisfl in Use json omitzero for struct-typed fields in cgroup structs elastic-agent-system-metrics#288
• [cgv2] Add CPU CFS quota, period, and weight metrics by @orestisfl in [cgv2] Add CPU CFS quota, period, and weight metrics elastic-agent-system-metrics#281
• Add missing zswap debug metrics by @orestisfl in Add missing zswap debug metrics elastic-agent-system-metrics#289

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works. Where relevant, I have used the stresstest.sh script to run them under stress conditions and race detector to verify their stability.
• I have added an entry in ./changelog/fragments using the changelog tool.

Disruptive User Impact

None. New features.

How to test this PR locally

1. Build metricbeat from the branch:

cd metricbeat
mage build

2. Create a test config file metricbeat.test.yml:

metricbeat.modules:
  - module: system
    period: 5s
    metricsets:
      - memory
      - process
    process.include_top_n:
      by_cpu: 5
      by_memory: 5

output.console:
  pretty: true

logging.level: debug

3. Run metricbeat:

./metricbeat -e -c metricbeat.test.yml

4. Verify zswap memory metrics appear in the output (requires Linux with zswap enabled -- check with cat /sys/module/zswap/parameters/enabled):

./metricbeat -e -c metricbeat.test.yml 2>/dev/null | jq 'select(.metricset.name == "memory") | .system.memory.zswap'

Expected output (values will vary):

{
  "compressed": 950353920,
  "uncompressed": 3813502976
}

5. To also verify the zswap.debug.* fields (requires debugfs access), grant the binary the cap_dac_read_search capability:

sudo setcap cap_dac_read_search=+ep metricbeat

Then re-run. Expected output with debug fields:

{
  "compressed": 950353920,
  "uncompressed": 3813502976,
  "debug": {
    "decompress_fail": 0,
    "pool_limit_hit": 0,
    "pool_total_size": 950353920,
    "reject_alloc_fail": 0,
    "reject_compress_fail": 0,
    "reject_compress_poor": 0,
    "reject_kmemcache_fail": 0,
    "reject_reclaim_fail": 0,
    "stored_incompressible_pages": 16779,
    "stored_pages": 931031,
    "written_back_pages": 29111
  }
}

6. Verify cfs.weight appears in process cgroup metrics (requires cgroupsv2):

./metricbeat -e -c metricbeat.test.yml 2>/dev/null | jq 'select(.metricset.name == "process") | .system.process.cgroup.cpu.cfs.weight // empty'

7. Run unit tests:

cd metricbeat
go test ./module/system/...

Related issues

• Closes [Metricbeat] Zswap Metrics #47605
• Closes system.process dataset should support cgroupv2 CPU metrics #47708

  ---

  This is an automatic backport of pull request [Metricbeat] Bump elastic-agent-system-metrics for zswap and cgroups v2 CPU CFS data #49098 done by Mergify.

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🔍 Preview links for changed docs

• docs/reference/metricbeat/exported-fields-system.md

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Vale Linting Results

Summary: 1 suggestion found

💡 Suggestions (1)

File	Line	Rule	Message
docs/reference/metricbeat/exported-fields-system.md	810	Elastic.WordChoice	Consider using 'select, press, visits' instead of 'hit', unless the term is in the UI.

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