viola: upstream

Signed-off-by: s0me1newithhand7s <git+me@hand7s.org>

viola/services/alloy.nix

@@ -0,0 +1,93 @@
+{pkgs, ...}: {
+  services = {
+    alloy = {
+      enable = true;
+      configPath = pkgs.writeText "alloy-config.alloy" ''
+        loki.source.journal "system" {
+          forward_to = [loki.process.production.receiver]
+          relabel_rules = loki.relabel.journal.rules
+          labels = {
+            host = "viola",
+            job  = "systemd",
+          }
+        }
+
+        loki.relabel "journal" {
+          forward_to = []
+          rule {
+            source_labels = ["__journal__systemd_unit"]
+            target_label  = "unit"
+          }
+        }
+
+        loki.write "local" {
+          endpoint {
+            url = "http://127.0.0.1:3100/loki/api/v1/push"
+          }
+        }
+
+        loki.process "production" {
+          forward_to = [loki.write.local.receiver]
+
+          stage.match {
+            selector = `{service_name=~"(alloy|forgejo|grafana|loki|microbin|mimir|stalwart|postgresql|redis|stalwart|static-web-server|tempo|traefik|vaultwarden|woodpecker|zitadel)\\.service"}`
+            action = "keep"
+          }
+        }
+
+        prometheus.exporter.unix "node" {
+          enable_collectors = [
+            "cpu", "diskstats", "filesystem",
+            "loadavg", "meminfo", "netdev",
+            "systemd", "time", "uname",
+          ]
+        }
+
+        prometheus.scrape "node" {
+          targets = prometheus.exporter.unix.node.targets
+          forward_to = [prometheus.remote_write.mimir.receiver]
+          scrape_interval = "30s"
+          job_name = "node"
+        }
+
+        prometheus.scrape "alloy" {
+          targets = [{"__address__" = "127.0.0.1:12345"}]
+
+          forward_to = [prometheus.remote_write.mimir.receiver]
+          job_name   = "alloy"
+        }
+
+        prometheus.remote_write "mimir" {
+          endpoint {
+            url = "http://127.0.0.1:9009/api/v1/push"
+          }
+        }
+
+        otelcol.receiver.otlp "default" {
+          grpc {
+            endpoint = "0.0.0.0:4317"
+          }
+
+          http {
+            endpoint = "0.0.0.0:4318"
+          }
+
+          output {
+            traces = [otelcol.exporter.otlp.tempo.input]
+            logs   = [otelcol.exporter.loki.local.input]
+          }
+        }
+
+        otelcol.exporter.otlp "tempo" {
+          client {
+            endpoint = "http://127.0.0.1:4317"
+          }
+        }
+
+        otelcol.exporter.loki "local" {
+          forward_to = [loki.write.local.receiver]
+        }
+      '';
+    };
+  };
+}