From 46ea00da2328e5e4065ce0acbf0b0427b6d6838a Mon Sep 17 00:00:00 2001
From: Martin Weinelt <hexa@darmstadt.ccc.de>
Date: Mon, 26 Jul 2021 15:52:56 +0200
Subject: [PATCH] nixos/prometheus-influxdb-exporter: init

---
 .../from_md/release-notes/rl-2111.section.xml |  8 +++++
 .../manual/release-notes/rl-2111.section.md   |  2 ++
 .../monitoring/prometheus/exporters.nix       |  1 +
 .../prometheus/exporters/influxdb.nix         | 34 +++++++++++++++++++
 4 files changed, 45 insertions(+)
 create mode 100644 nixos/modules/services/monitoring/prometheus/exporters/influxdb.nix

diff --git a/nixos/doc/manual/from_md/release-notes/rl-2111.section.xml b/nixos/doc/manual/from_md/release-notes/rl-2111.section.xml
index 9dd98a5262f8..1db624286fa3 100644
--- a/nixos/doc/manual/from_md/release-notes/rl-2111.section.xml
+++ b/nixos/doc/manual/from_md/release-notes/rl-2111.section.xml
@@ -125,6 +125,14 @@
           <link linkend="opt-services.prometheus.exporters.buildkite-agent.enable">services.prometheus.exporters.buildkite-agent</link>.
         </para>
       </listitem>
+      <listitem>
+        <para>
+          <link xlink:href="https://github.com/prometheus/influxdb_exporter">influxdb-exporter</link>
+          a Prometheus exporter that exports metrics received on an
+          InfluxDB compatible endpoint is now available as
+          <link linkend="opt-services.prometheus.exporters.influxdb.enable">services.prometheus.exporters.influxdb</link>.
+        </para>
+      </listitem>
     </itemizedlist>
   </section>
   <section xml:id="sec-release-21.11-incompatibilities">
diff --git a/nixos/doc/manual/release-notes/rl-2111.section.md b/nixos/doc/manual/release-notes/rl-2111.section.md
index 12e1a9384331..a1690120b70d 100644
--- a/nixos/doc/manual/release-notes/rl-2111.section.md
+++ b/nixos/doc/manual/release-notes/rl-2111.section.md
@@ -39,6 +39,8 @@ pt-services.clipcat.enable).
 
 - [buildkite-agent-metrics](https://github.com/buildkite/buildkite-agent-metrics), a command-line tool for collecting Buildkite agent metrics, now has a Prometheus exporter available as [services.prometheus.exporters.buildkite-agent](#opt-services.prometheus.exporters.buildkite-agent.enable).
 
+- [influxdb-exporter](https://github.com/prometheus/influxdb_exporter) a Prometheus exporter that exports metrics received on an InfluxDB compatible endpoint is now available as [services.prometheus.exporters.influxdb](#opt-services.prometheus.exporters.influxdb.enable).
+
 ## Backward Incompatibilities {#sec-release-21.11-incompatibilities}
 
 - The `staticjinja` package has been upgraded from 1.0.4 to 3.0.1
diff --git a/nixos/modules/services/monitoring/prometheus/exporters.nix b/nixos/modules/services/monitoring/prometheus/exporters.nix
index d648de6a4148..9182c2f2ed87 100644
--- a/nixos/modules/services/monitoring/prometheus/exporters.nix
+++ b/nixos/modules/services/monitoring/prometheus/exporters.nix
@@ -33,6 +33,7 @@ let
     "domain"
     "dovecot"
     "fritzbox"
+    "influxdb"
     "json"
     "jitsi"
     "kea"
diff --git a/nixos/modules/services/monitoring/prometheus/exporters/influxdb.nix b/nixos/modules/services/monitoring/prometheus/exporters/influxdb.nix
new file mode 100644
index 000000000000..ba45173e946a
--- /dev/null
+++ b/nixos/modules/services/monitoring/prometheus/exporters/influxdb.nix
@@ -0,0 +1,34 @@
+{ config, lib, pkgs, options }:
+
+with lib;
+
+let
+  cfg = config.services.prometheus.exporters.influxdb;
+in
+{
+  port = 9122;
+  extraOpts = {
+    sampleExpiry = mkOption {
+      type = types.str;
+      default = "5m";
+      example = "10m";
+      description = "How long a sample is valid for";
+    };
+    udpBindAddress = mkOption {
+      type = types.str;
+      default = ":9122";
+      example = "192.0.2.1:9122";
+      description = "Address on which to listen for udp packets";
+    };
+  };
+  serviceOpts = {
+    serviceConfig = {
+      RuntimeDirectory = "prometheus-influxdb-exporter";
+      ExecStart = ''
+        ${pkgs.prometheus-influxdb-exporter}/bin/influxdb_exporter \
+        --web.listen-address ${cfg.listenAddress}:${toString cfg.port} \
+        --influxdb.sample-expiry ${cfg.sampleExpiry} ${concatStringsSep " " cfg.extraFlags}
+      '';
+    };
+  };
+}