feat(tente): derive filetype metadata for HTTP requests

1 files changed, 45 insertions, 1 deletions

diff --git a/nixos/hosts/tente/monitoring.nix b/nixos/hosts/tente/monitoring.nix
index c761018..ce0d302 100644
--- a/nixos/hosts/tente/monitoring.nix
+++ b/nixos/hosts/tente/monitoring.nix
@@ -180,7 +180,7 @@ in
           }
 
           stage.json {
-            expressions = { "msec" = "" }
+            expressions = { "msec" = "", path = "" }
           }
 
           stage.timestamp {
@@ -199,6 +199,50 @@ in
           stage.structured_metadata {
             values = { level = "" }
           }
+
+          stage.labels {
+            values = {
+              // Temporarily adding path as a label so that we can use it in the match selectors.
+              path = "",
+            }
+          }
+
+          stage.match {
+            selector = "{path=~\"/\\\\.well-known/.*\"}"
+            // Creating the filetype entry via stage.template because there's no
+            // static_structured_metadata stage yet. (https://github.com/grafana/loki/issues/16703)
+            stage.template {
+              source = "filetype"
+              template = "well-known"
+            }
+          }
+
+          stage.match {
+            selector = "{path=\"/robots.txt\"}"
+            stage.template {
+              source = "filetype"
+              template = "robots.txt"
+            }
+          }
+
+          stage.match {
+            selector = "{path=~\".*\\\\.atom$\"}"
+            stage.template {
+              source = "filetype"
+              template = "feed"
+            }
+          }
+
+          stage.structured_metadata {
+            values = {
+              filetype = "",
+            }
+          }
+
+          // Dropping path again because it has a too high cardinality for a label.
+          stage.label_drop {
+            values = [ "path" ]
+          }
         }
 
         loki.write "default" {