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# Background Erigon currently uses a combination of Victoria Metrics and Prometheus client for providing metrics. We want to rationalize this and use only the Prometheus client library, but we want to maintain the simplified Victoria Metrics methods for constructing metrics. This task is currently partly complete and needs to be finished to a stage where we can remove the Victoria Metrics module from the Erigon code base. ## Tests ### Functional * Make sure that the format change int->float implied by VM to Prometheus does not impact clients (pay particular attention to block numbers) * Check that the prometheus/grafana dashboards defined in cmd/prometheus are functional after the change (see docker-compose.yml for details and https://github.com/ledgerwatch/erigon/tree/devel/cmd/prometheus#readme) * Confirm that the underlying go metrics are still generated * Confirm the following flags setting work: --metrics, --metrics.addr, --metrics.port with the new code * Confirm that --metrics and --proff settings and handlers configuration still allow metrics and pprof to share a port #### Float counters - scientific notation test case   #### Float counters - NaN test case   ### Performance * Check the performance of counters created by RPC calls measurements created by rpc/metrics.go are not impacted by the change. #### RPC Performed tests on rpcdaemon & erigon on localhost using `etc_blockNumber`. Did tests with 100, 1000, 10000 requests. Got a steady 15 ms response time. #### Memory  |
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erigon-lib
Parts of Erigon codebase, written from scratch and licensed under Apache 2.0.
License requirements
erigon-lib dependencies use various open source licenses compatible with Apache 2.0. This is checked on CI using make lint-licenses.
In order to keep license purity it is not allowed to refer to the code in the erigon root module from erigon-lib. This is ensured by the go.mod separation.
It is not allowed to copy or move code from erigon to erigon-lib unless all original authors agree to relief the code license from GPL to Apache 2.0.
Code migration policy
It is encouraged to write new erigon code inside erigon-lib.
It is encouraged to move and relicense parts of the code from erigon to erigon-lib that are safe and easy to move. For example, code written from scratch by erigon core contributors that has no significant external contributions could be refactored and moved.