ildkule: restructure prometheus config

hosts/ildkule/services/metrics/prometheus/matrix-synapse.nix

@@ -0,0 +1,40 @@
+{ ... }:
+{
+  services.prometheus.scrapeConfigs = [{
+    job_name = "synapse";
+    scrape_interval = "15s";
+    scheme = "https";
+
+    http_sd_configs = [{
+      url = "https://matrix.pvv.ntnu.no/metrics/config.json";
+    }];
+
+    relabel_configs = [
+      {
+        source_labels = [ "__address__" ];
+        regex = "[^/]+(/.*)";
+        target_label = "__metrics_path__";
+      }
+      {
+        source_labels = [ "__address__" ];
+        regex = "([^/]+)/.*";
+        target_label = "instance";
+      }
+      {
+        source_labels = [ "__address__" ];
+        regex = "[^/]+\\/+[^/]+/(.*)/\\d+$";
+        target_label = "job";
+      }
+      {
+        source_labels = [ "__address__" ];
+        regex = "[^/]+\\/+[^/]+/.*/(\\d+)$";
+        target_label = "index";
+      }
+      {
+        source_labels = [ "__address__" ];
+        regex = "([^/]+)/.*";
+        target_label = "__address__";
+      }
+    ];
+  }];
+}