[app-admin/loki] interim version, not really tested.

app-admin/loki/Manifest

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+DIST loki-2.9.10.tar.gz 46118052 BLAKE2B 44543f1df61b47e5815251ac05e6b4bdbfee86f39f6f4ecfcb122e9d4eb631b581890a67f68a43c272695ab493707de76d47289aab87078eb08f7b37403fc6ba SHA512 d9c1bbdbd7c04de6ea61de269a3eeb015e1342cfef5567b91a04324f586ce16d24462a9fe56b8c5c1376b677da229768653b41623b092aa4ca6a057d4667edfe

app-admin/loki/files/loki.confd

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+# The loki config file
+LOKI_CONF="/etc/loki/loki-local-config.yaml"
+
+# Add any extra options to pass to loki to this setting.
+#LOKI_OPTS=""

app-admin/loki/files/loki.initd

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+#!/sbin/openrc-run
+
+configfile="${LOKI_CONF:-/etc/loki/loki-local-config.yaml}"
+
+command=/usr/bin/loki
+command_args="-config.file=${configfile}
+	${LOKI_OPTS}"
+command_background=yes
+command_user=loki:grafana
+make_pidfile=yes
+pidfile=/var/run/loki.pid

app-admin/loki/files/loki.service

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+[Unit]
+Description=Loki
+Wants=network-online.target
+After=network-online.target
+
+[Service]
+User=loki
+Group=grafana
+Type=simple
+Restart=on-failure
+EnvironmentFile=/etc/conf.d/loki
+Environment=LOKI_CONF=/etc/loki/loki-local-config.yaml
+ExecStart=/usr/bin/loki -config.file=${LOKI_CONF} ${LOKI_OPTS}
+PIDFile=/run/loki.pid
+
+[Install]
+WantedBy=multi-user.target

app-admin/loki/loki-2.9.10.ebuild

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+# Copyright 1999-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit go-module systemd
+
+DESCRIPTION="Like Prometheus, but for logs."
+HOMEPAGE="https://grafana.com/loki"
+SRC_URI="https://github.com/grafana/loki/archive/v${PV}.tar.gz -> ${P}.tar.gz"
+
+LICENSE="Apache-2.0"
+SLOT="0"
+KEYWORDS="~amd64"
+
+IUSE="+server tools systemd"
+
+RESTRICT="mirror strip"
+
+RDEPEND="acct-group/grafana
+	acct-user/${PN}"
+DEPEND="${RDEPEND}"
+
+src_compile() {
+	BUILD_VERSION="${PV}"
+	BUILD_REVISION="${PV}"
+	BUILD_USER="${P}"
+	BUILD_DATE=`date -u +"%Y-%m-%dT%H:%M:%SZ"`
+
+	VPREFIX="github.com/grafana/${PN}/vendor/github.com/prometheus/common/version"
+
+	EGO_LDFLAGS="-s -w -X ${VPREFIX}.Version=${BUILD_VERSION} -X ${VPREFIX}.Revision=${BUILD_REVISION} -X ${VPREFIX}.BuildUser=${BUILD_USER} -X ${VPREFIX}.BuildDate=${BUILD_DATE}"
+
+	if use server; then
+		einfo "Building cmd/${PN}/${PN}..."
+		CGO_ENABLED=0 go build -ldflags "-extldflags \"-static\" ${EGO_LDFLAGS}" -tags netgo -mod vendor -o cmd/${PN}/${PN} ./cmd/${PN} || die
+	fi
+	if use tools; then
+		einfo "Building cmd/logcli/logcli..."
+		CGO_ENABLED=0 go build -ldflags "-extldflags \"-static\" ${EGO_LDFLAGS}" -tags netgo -mod vendor -o cmd/logcli/logcli ./cmd/logcli || die
+		einfo "Building cmd/${PN}-canary/${PN}-canary..."
+		CGO_ENABLED=0 go build -ldflags "-extldflags \"-static\" ${EGO_LDFLAGS}" -tags netgo -mod vendor -o cmd/${PN}-canary/${PN}-canary ./cmd/${PN}-canary || die
+	fi
+}
+
+src_install() {
+	if use server; then
+		dobin "${S}/cmd/${PN}/${PN}"
+
+		newconfd "${FILESDIR}/${PN}.confd" "${PN}"
+		newinitd "${FILESDIR}/${PN}.initd" "${PN}"
+		use systemd && systemd_newunit "${FILESDIR}"/${PN}.service ${PN}.service
+
+		insinto "/etc/${PN}"
+		doins "${S}/cmd/${PN}/${PN}-local-config.yaml"
+		keepdir "/etc/${PN}"
+		keepdir "/var/lib/${PN}"
+		fowners ${PN}:grafana "/etc/${PN}"
+		fowners ${PN}:grafana "/var/lib/${PN}"
+	fi
+	if use tools; then
+		dobin "${S}/cmd/logcli/logcli"
+		dobin "${S}/cmd/${PN}-canary/${PN}-canary"
+	fi
+}

app-admin/loki/metadata.xml

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+<?xml version="1.0" ?>
+<!DOCTYPE pkgmetadata
+  SYSTEM 'http://www.gentoo.org/dtd/metadata.dtd'>
+<pkgmetadata>
+  <use>
+    <flag name="fluent-bit">Build the fluent-bit plugin to publish from app-admin/fluent-bit</flag>
+    <flag name="promtail">Build the promtail log gathering agent</flag>
+    <flag name="server">Build the loki server</flag>
+    <flag name="tools">Build the loki tools logcli and loki-canary</flag>
+  </use>
+  <upstream>
+    <remote-id type="github">grafana/loki</remote-id>
+  </upstream>
+</pkgmetadata>