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grafana.com
In short: Grafana Plugin Catalog (grafana.com) accepts public grafana plugin project page. It is free to submit, takes a moderate amount of preparation, and scores 84/100 on our impact ranking (high impact).
Build a panel, data-source or app plugin, validate and package it, then submit it with project links and test data.
Grafana reviews each plugin case-by-case; commercial-offering plugins may require paid terms.
Priority is high, which sets the band. It is free and moderate to complete, which adjusts it within that band. The score ranks your queue — it is not a measure of domain authority.