Setting declarativePlugins to any list -- the empty one included -- also
sets upstream's plugins.preinstall_disabled, which nixpkgs defaults to
declarativePlugins != null. Preinstall is what fetches the Drilldown apps
on first start, so claiming the plugin directory removed them without
touching anything a person had installed.
The comment above that line reasoned about the plugin path and the update
check and never about preinstall, and its closing claim -- nothing is
taken over on a hive with no plugins -- was true only of plugins a PERSON
installs. Upstream installs some itself, and those are the ones that went
missing.
Listing it as a package is better than the preinstall it replaces: store
pinned, no runtime fetch from grafana.com, survives a state reset. Its
Logs/Traces/Profiles siblings stay off -- they front Loki, Tempo and
Pyroscope, none of which this swarm runs.
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