From d42b99ea59c530a3a8337ad12fc1b45a8997172c Mon Sep 17 00:00:00 2001
From: Florian Sesser <florian@private.storage>
Date: Fri, 11 Feb 2022 07:17:31 +0000
Subject: [PATCH] Add comment about journal internal labels
---
nixos/modules/monitoring/exporters/promtail.nix | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/nixos/modules/monitoring/exporters/promtail.nix b/nixos/modules/monitoring/exporters/promtail.nix
index c056ebeb..e279b481 100644
--- a/nixos/modules/monitoring/exporters/promtail.nix
+++ b/nixos/modules/monitoring/exporters/promtail.nix
@@ -39,6 +39,10 @@ in {
host = hostName;
};
};
+ # The journal has many internal labels, that by default will
+ # be dropped because of their "__" prefix. To keep them, rename them.
+ # https://grafana.com/docs/loki/latest/clients/promtail/scraping/#journal-scraping-linux-only
+ # https://www.freedesktop.org/software/systemd/man/systemd.journal-fields.html
relabel_configs = [{
source_labels = [ "__journal__systemd_unit" ];
target_label = "unit";
--
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