metrics: add support for enabling metrics from env vars #28118
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…reum#28118)" This reverts commit e284083.
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…reum#28118)" This reverts commit e284083.
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This is another followup PR to fix corner cases in the env var support. The metrics subsystem completely ignores the CLI library and rather directly checks if
--metricsor--metrics.expensiveis specified inos.Args. It does this to ensure that my the time anything accessesmetrics.Enabled, the field has been correctly initialized, even if it's accessed on package initializer methods.This PR extends this part of the logic to also check for
GETH_METRICSandGETH_METRICS_EXPENSIVEenv vars in the same vein. A tad ugly for sure, but beats rethinking all the initialization logic.