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fix(swarm-grafana): drop the Loki-only Logs Drilldown app

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grafana-lokiexplore-app cannot query VictoriaLogs. Its volume views call
/loki/api/v1/index/volume, which VictoriaLogs does not implement and
answers "unsupported path requested", and upstream's position is that
the datasource plugin must provide drilldown support. No configuration
here changes that, so the app only ever offered a menu entry that looks
like a broken feature rather than an absent one.

The option's own description already ruled its siblings out for fronting
backends this swarm does not run. That premise expired when the swarm
gained a log store, which is what made adding this one look reasonable —
so the reason is rewritten rather than the list alone: Logs Drilldown is
excluded on compatibility, not on absence.

Explore with the VictoriaLogs datasource is the log browser, and
docs/swarm/services.md now says so where an operator looks for it.
This commit is contained in:
atlas 2026-08-24 21:23:24 +02:00
commit 923638ab98
1 changed files with 13 additions and 13 deletions
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26
nix/host-modules/swarm-grafana.nix
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@ -261,21 +261,14 @@ in
type = lib.types.listOf lib.types.package;
default = [
pkgs.grafanaPlugins.grafana-metricsdrilldown-app
# Reading the swarm's logs needs both halves: the datasource that can
# speak LogsQL, and the browser that makes an unfamiliar log stream
# explorable without writing a query first.
#
# ⚠️ The app's plugin id is `grafana-lokiexplore-app` and its name is
# "Grafana Logs Drilldown" — Grafana renamed the product and kept the
# id. Searching nixpkgs for "logsdrilldown" finds nothing.
# Reading the swarm's logs needs the datasource that speaks LogsQL.
# Nothing is paired with it to browse them: Explore is that browser.
pkgs.grafanaPlugins.victoriametrics-logs-datasource
pkgs.grafanaPlugins.grafana-lokiexplore-app
];
defaultText = lib.literalExpression ''
[
pkgs.grafanaPlugins.grafana-metricsdrilldown-app
pkgs.grafanaPlugins.victoriametrics-logs-datasource
pkgs.grafanaPlugins.grafana-lokiexplore-app
]'';
example = lib.literalExpression "[ pkgs.grafanaPlugins.grafana-piechart-panel ]";
description = ''
@ -300,10 +293,17 @@ in
Metrics Drilldown is on by default because this swarm's Grafana
exists to read VictoriaMetrics, and the queryless metrics browser
is the part of that people actually reach for. Its Logs / Traces /
Profiles siblings are deliberately NOT here: they front Loki,
Tempo and Pyroscope, none of which this swarm runs, so they would
install a UI for a backend that does not answer.
is the part of that people actually reach for.
Its Logs / Traces / Profiles siblings are deliberately NOT here,
and for two different reasons. Traces and Profiles front Tempo
and Pyroscope, which this swarm does not run — a UI for a backend
that does not answer. Logs Drilldown is the subtler one: this
swarm *does* run a log store, so that argument no longer applies
to it, but the app is Loki-only and no configuration here changes
that. Its volume views call `/loki/api/v1/index/volume`, which
VictoriaLogs does not implement and answers "unsupported path
requested". Logs are browsed through Explore instead.
'';
};
};