[receiver/hostmetrics] Add available memory state

[lootek]

Description:

Add available memory state to hostmetricsreceiver.

Link to tracking Issue:
#7417

Testing:
Updated the relevant memoryscraper unit tests.

Documentation:
The hostmetricsreceiver/memoryscraper docs were updated (regenerated)

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: lootek / name: Piotr Lucinski (0d4fc66, c28fb17, 83c7902, 1357d66)

[runforesight]

Foresight Summary

    
Major Impacts

build-and-test duration(44 minutes 38 seconds) has decreased 25 minutes 55 seconds compared to main branch avg(1 hour 10 minutes 33 seconds).

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⭕  build-and-test-windows workflow has finished in 6 seconds (44 minutes 19 seconds less than main branch avg.) and finished at 5th Mar, 2023.

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Job	Failed Steps	Tests
windows-unittest-matrix	-     🔗	N/A	See Details
windows-unittest	-     🔗	N/A	See Details

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✅  telemetrygen workflow has finished in 1 minute 13 seconds (1 minute 47 seconds less than main branch avg.) and finished at 5th Mar, 2023.

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build-dev	-     🔗	N/A	See Details
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✅  check-links workflow has finished in 1 minute 33 seconds (49 seconds less than main branch avg.) and finished at 5th Mar, 2023.

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✅  changelog workflow has finished in 2 minutes 21 seconds and finished at 5th Mar, 2023.

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✅  prometheus-compliance-tests workflow has finished in 10 minutes 53 seconds (⚠️ 2 minutes 13 seconds more than main branch avg.) and finished at 5th Mar, 2023.

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prometheus-compliance-tests	-     🔗	✅ 21  ❌ 0  ⏭ 0    🔗	See Details

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✅  build-and-test workflow has finished in 44 minutes 38 seconds (25 minutes 55 seconds less than main branch avg.) and finished at 5th Mar, 2023.

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Job	Failed Steps	Tests
correctness-metrics	-     🔗	✅ 2  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.20, internal)	-     🔗	✅ 561  ❌ 0  ⏭ 0    🔗	See Details
correctness-traces	-     🔗	✅ 17  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, extension)	-     🔗	✅ 537  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.20, extension)	-     🔗	✅ 537  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, processor)	-     🔗	✅ 1525  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, internal)	-     🔗	✅ 561  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.20, processor)	-     🔗	✅ 1525  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.20, receiver-0)	-     🔗	✅ 2580  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, receiver-0)	-     🔗	✅ 2580  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, exporter)	-     🔗	✅ 2456  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.20, exporter)	-     🔗	✅ 2456  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, receiver-1)	-     🔗	✅ 1937  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, other)	-     🔗	✅ 4788  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.20, other)	-     🔗	✅ 4788  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.20, receiver-1)	-     🔗	✅ 1937  ❌ 0  ⏭ 0    🔗	See Details
integration-tests	-     🔗	✅ 55  ❌ 0  ⏭ 0    🔗	See Details
setup-environment	-     🔗	N/A	See Details
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checks	-     🔗	N/A	See Details
build-examples	-     🔗	N/A	See Details
unittest (1.20)	-     🔗	N/A	See Details
unittest (1.19)	-     🔗	N/A	See Details
lint	-     🔗	N/A	See Details
cross-compile (darwin, amd64)	-     🔗	N/A	See Details
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cross-compile (linux, 386)	-     🔗	N/A	See Details
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cross-compile (linux, arm64)	-     🔗	N/A	See Details
cross-compile (linux, ppc64le)	-     🔗	N/A	See Details
cross-compile (windows, 386)	-     🔗	N/A	See Details
cross-compile (windows, amd64)	-     🔗	N/A	See Details
build-package (deb)	-     🔗	N/A	See Details
build-package (rpm)	-     🔗	N/A	See Details
windows-msi	-     🔗	N/A	See Details
publish-check	-     🔗	N/A	See Details
publish-stable	-     🔗	N/A	See Details
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✅  load-tests workflow has finished in 15 minutes 24 seconds and finished at 5th Mar, 2023.

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Job	Failed Steps	Tests
loadtest (TestTraceAttributesProcessor)	-     🔗	✅ 3  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestMetric10kDPS|TestMetricsFromFile)	-     🔗	✅ 6  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestIdleMode)	-     🔗	✅ 1  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestTraceNoBackend10kSPS|TestTrace1kSPSWithAttrs)	-     🔗	✅ 8  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestTraceBallast1kSPSWithAttrs|TestTraceBallast1kSPSAddAttrs)	-     🔗	✅ 10  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestMetricResourceProcessor|TestTrace10kSPS)	-     🔗	✅ 12  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestBallastMemory|TestLog10kDPS)	-     🔗	✅ 18  ❌ 0  ⏭ 0    🔗	See Details
setup-environment	-     🔗	N/A	See Details

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✅  e2e-tests workflow has finished in 17 minutes 48 seconds and finished at 5th Mar, 2023.

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Job	Failed Steps	Tests
kubernetes-test (v1.26.0)	-     🔗	N/A	See Details
kubernetes-test (v1.24.7)	-     🔗	N/A	See Details
kubernetes-test (v1.25.3)	-     🔗	N/A	See Details
kubernetes-test (v1.23.13)	-     🔗	N/A	See Details

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[lootek]

Closing this one as

• [receiver/hostmetrics] Add available memory state (optionally) #19149

looks like the desired solution