NixOS now emits a deprecation warning if systemd's <literal>StartLimitInterval</literal> setting is used in a <literal>serviceConfig</literal> section instead of in a <literal>unitConfig</literal>; that setting is deprecated and now undocumented for the service section by systemd upstream, but still effective and somewhat buggy there, which can be confusing. See <linkxlink:href="https://github.com/NixOS/nixpkgs/issues/45785">#45785</link> for details.
</para>
<para>
All services should use <xreflinkend="opt-systemd.services._name_.startLimitIntervalSec"/> or <literal>StartLimitIntervalSec</literal> in <xreflinkend="opt-systemd.services._name_.unitConfig"/> instead.