nginxlog_exporter: metrics from nginx access log (#911)

Author: leomuso

app-metrics/prometheus-nginxlog-exporter/Manifest

@@ -0,0 +1,2 @@
+DIST prometheus-nginxlog-exporter-1.11.0-deps.tar.xz 251260216 BLAKE2B f8b75c0255cbc5431c53080aefbb0201aa5e968a9e0b899a17e2feff4482ffe513a6a509d70e5a9b5a07a54efb7f89dfc6e8933bf7612b4de39e3bfc854057f5 SHA512 2d7a1c0916854dd84d7155a7759cc90403adb06db98cb840e95eca4e2e8d07cc29d25f88593b7259c13950e6f00ee7203ee7209286ea688f284febf270db8422
+DIST prometheus-nginxlog-exporter-1.11.0.tar.gz 51042 BLAKE2B 66b09a1753bb9aa7f6269600bd699ff057c5c9849792866b2c771fe27806357e85b6ad8ff7ad306e93a77105789df8ccce9747c56d013db7e189018d992686a9 SHA512 72720359f862ce8186e8ed7d2297197d998ffec48f076f8851e7166b3e6b3e95e6cfd0cef9afa6c18a6fb6712a9db6fb19624895569a301019c9e18d94fa9d15

app-metrics/prometheus-nginxlog-exporter/files/config.hcl

@@ -0,0 +1,5 @@
+listen {
+  port = 4040
+  address = "0.0.0.0"
+  metrics_endpoint = "/metrics"
+}

app-metrics/prometheus-nginxlog-exporter/files/prometheus-nginxlog-exporter.initd

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+#!/sbin/openrc-run
+# Copyright 2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+name="prometheus-nginxlog-exporter daemon"
+description="Prometheus exporter for NGINX Log metrics."
+command="/usr/bin/prometheus-nginxlog-exporter"
+pidfile="/run/${RC_SVCNAME}.pid"
+output_log="/var/log/prometheus-nginxlog-exporter/prometheus-nginxlog-exporter.log"
+error_log="/var/log/prometheus-nginxlog-exporter/prometheus-nginxlog-exporter.log"
+command_background="yes"
+command_args="-config-file /etc/prometheus-nginxlog-exporter/config.hcl"
+command_user="${PROMETHEUS_NGINXLOG_EXPORTER_USER:-nginx}:${PROMETHEUS_NGINXLOG_EXPORTER_USER:-nginx}"
+
+depend() {
+    need net
+}
+
+start_pre() {
+    checkpath -d -m 0755 -o ${PROMETHEUS_NGINXLOG_EXPORTER_USER:-nginx}:${PROMETHEUS_NGINXLOG_EXPORTER_USER:-nginx} /var/log/prometheus-nginxlog-exporter
+    checkpath -f -m 0644 -o ${PROMETHEUS_NGINXLOG_EXPORTER_USER:-nginx}:${PROMETHEUS_NGINXLOG_EXPORTER_USER:-nginx} "$output_log"
+    checkpath -f -m 0644 -o ${PROMETHEUS_NGINXLOG_EXPORTER_USER:-nginx}:${PROMETHEUS_NGINXLOG_EXPORTER_USER:-nginx} "$error_log"
+}

app-metrics/prometheus-nginxlog-exporter/metadata.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+	<maintainer type="person">
+		<email>ops@adjust.com</email>
+		<name>Adjust Ops</name>
+	</maintainer>
+	<upstream>
+		<remote-id type="github">martin-helmich/prometheus-nginxlog-exporter</remote-id>
+	</upstream>
+</pkgmetadata>

app-metrics/prometheus-nginxlog-exporter/prometheus-nginxlog-exporter-1.11.0.ebuild

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+# Copyright 2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit go-module
+
+# Project name and version
+DESCRIPTION="Prometheus NGINX log exporter"
+HOMEPAGE="https://github.com/martin-helmich/prometheus-nginxlog-exporter"
+SRC_URI="
+		${HOMEPAGE}/archive/refs/tags/v${PV}.tar.gz -> ${P}.tar.gz
+		https://files.adjust.com/${P}.tar.xz -> ${P}-deps.tar.xz
+"
+
+LICENSE="Apache-2.0 license"
+KEYWORDS="~amd64"
+SLOT="0"
+IUSE="doc"
+
+DEPEND="
+	acct-group/nginx
+	acct-user/nginx
+	>=dev-lang/go-1.20
+"
+
+RDEPEND="${DEPEND}"
+SRC_DIR="${WORKDIR}/${P}"
+
+RESTRICT="network-sandbox"
+
+src_unpack() {
+	default
+}
+
+src_prepare() {
+	default
+}
+
+src_compile() {
+	export GOPATH="${SRC_DIR}"
+	cd "${SRC_DIR}"
+	ego build
+}
+
+src_test() {
+	cd "${SRC_DIR}"
+	go test -v ./...
+}
+
+src_install() {
+	dobin "${PN}"
+
+	newinitd "${FILESDIR}/${PN}.initd" ${PN}
+	dosym /etc/init.d/${PN} /etc/runlevels/default/${PN}
+
+	insinto /etc/${PN}
+	doins "${FILESDIR}/config.hcl"
+
+	# Create log directory and file
+	keepdir /var/log/${PN}
+
+	# Change ownership of the log file to nginx:nginx
+	fowners ${PROMETHEUS_NGINXLOG_EXPORTER_USER:-nginx}:${PROMETHEUS_NGINXLOG_EXPORTER_USER:-nginx} /var/log/${PN}
+	fowners ${PROMETHEUS_NGINXLOG_EXPORTER_USER:-nginx}:${PROMETHEUS_NGINXLOG_EXPORTER_USER:-nginx} /etc/${PN}/config.hcl
+}