Host metrics instrumentation #231
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jmacd
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Aneurysm9,
evantorrie,
lizthegrey and
MrAlias
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MrAlias
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Aug 18, 2020
MrAlias
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Aug 20, 2020
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plantfansam
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Mar 18, 2022
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This instrumentation module implements metrics that the OTel Collector would also generate via its "hostmetrics" receiver. This covers only a minimum amount of information that is generally useful for monitoring, and leaves open questions about how to handle OS-specific metrics (esp. memory) and whether to encode per-CPU and per-NIC measurements for CPU and Network. See the new TODOs.
While working on this I filed several related specification questions:
open-telemetry/opentelemetry-specification#818
open-telemetry/opentelemetry-specification#819
This raises a very serious potential to share code with the OTel Collector's hostmetrics receiver, as that code is more thorough and handles OS-specific fields (with mock tests). On the other hand, factoring out that code module would be easier if we could migrate to using the real OTel-Go Metric SDK to generate these measurements. This is not out of the question, but too much work for this little PR, so I'll suggest that we start small with just a few metrics and evaluate this possibility later.