diff --git a/net-mgmt/Makefile b/net-mgmt/Makefile
index 076c58d24133..0017d54cd56c 100644
--- a/net-mgmt/Makefile
+++ b/net-mgmt/Makefile
@@ -8,6 +8,7 @@
     SUBDIR += adcli
     SUBDIR += aggregate
     SUBDIR += aircrack-ng
+    SUBDIR += alertmanager
     SUBDIR += ap-utils
     SUBDIR += argus3
     SUBDIR += argus3-clients
diff --git a/net-mgmt/alertmanager/Makefile b/net-mgmt/alertmanager/Makefile
new file mode 100644
index 000000000000..359bd9dadb6c
--- /dev/null
+++ b/net-mgmt/alertmanager/Makefile
@@ -0,0 +1,38 @@
+# Created by: Michal Hanula <michal@hanu.la>
+# $FreeBSD$
+
+PORTNAME=	alertmanager
+PORTVERSION=	0.5.1
+DISTVERSIONPREFIX=	v
+CATEGORIES=	net-mgmt
+
+MAINTAINER=	michal@hanu.la
+COMMENT=	Alert routing for prometheus
+
+LICENSE=	APACHE20
+
+USES=		go gmake
+USE_GITHUB=	yes
+GH_ACCOUNT=	prometheus
+
+GO_PKGNAME=	github.com/prometheus/${PORTNAME}
+
+USE_RC_SUBR=	alertmanager
+
+USERS=		alertmanager
+GROUPS=		alertmanager
+
+PLIST_FILES=	bin/alertmanager \
+		etc/alertmanager/alertmanager.yml.sample
+
+STRIP=		# stripping can break go binaries
+
+do-build:
+	(cd ${GO_WRKSRC}/cmd/alertmanager ; ${SETENV} ${GO_ENV} go install)
+
+do-install:
+	${INSTALL_PROGRAM} ${GO_WRKDIR_BIN}/alertmanager ${STAGEDIR}${PREFIX}/bin
+	${MKDIR} ${STAGEDIR}${PREFIX}/etc/alertmanager
+	${INSTALL_DATA} ${WRKSRC}/doc/examples/simple.yml ${STAGEDIR}${PREFIX}/etc/alertmanager/alertmanager.yml.sample
+
+.include <bsd.port.mk>
diff --git a/net-mgmt/alertmanager/distinfo b/net-mgmt/alertmanager/distinfo
new file mode 100644
index 000000000000..ea11621cf984
--- /dev/null
+++ b/net-mgmt/alertmanager/distinfo
@@ -0,0 +1,3 @@
+TIMESTAMP = 1484488566
+SHA256 (prometheus-alertmanager-v0.5.1_GH0.tar.gz) = 98a5f698896001313f2f9ad691fa75f0ae3b7220a97bbe560032b543e532d4a7
+SIZE (prometheus-alertmanager-v0.5.1_GH0.tar.gz) = 1191666
diff --git a/net-mgmt/alertmanager/files/alertmanager.in b/net-mgmt/alertmanager/files/alertmanager.in
new file mode 100644
index 000000000000..0d766945153a
--- /dev/null
+++ b/net-mgmt/alertmanager/files/alertmanager.in
@@ -0,0 +1,67 @@
+#!/bin/sh
+
+# PROVIDE: alertmanager
+# REQUIRE: LOGIN
+# KEYWORD: shutdown
+#
+# Add the following lines to /etc/rc.conf.local or /etc/rc.conf
+# to enable this service:
+#
+# alertmanager_enable (bool):     Set to NO by default
+#                               Set it to YES to enable alertmanager
+# alertmanager_user (string):     Set user to run alertmanager
+#                               Default is "alertmanager"
+# alertmanager_group (string):    Set group to run alertmanager
+#                               Default is "alertmanager"
+# alertmanager_config (string):   The configuration file
+#                               Default is "%%PREFIX%%/etc/alertmanager/alertmanager.yml"
+# alertmanager_data_dir (string):   The configuration file
+#                               Default is "/var/db/alertmanager"
+# alertmanager_log_file (string): Set file that alertmanager will log to
+#                               Default is "/var/log/alertmanager.log"
+# alertmanager_args (string):     Set additional command line arguments
+#                               Default is ""
+
+. /etc/rc.subr
+
+name=alertmanager
+rcvar=alertmanager_enable
+
+load_rc_config $name
+
+: ${alertmanager_enable:="NO"}
+: ${alertmanager_user:="alertmanager"}
+: ${alertmanager_group:="alertmanager"}
+: ${alertmanager_config:="%%PREFIX%%/etc/alertmanager/alertmanager.yml"}
+: ${alertmanager_data_dir:="/var/db/alertmanager"}
+: ${alertmanager_log_file:="/var/log/alertmanager.log"}
+: ${alertmanager_args:=""}
+
+pidfile=/var/run/alertmanager.pid
+required_files="${alertmanager_config}"
+command="/usr/sbin/daemon"
+procname="%%PREFIX%%/bin/alertmanager"
+sig_reload=HUP
+extra_commands="reload"
+command_args="-p ${pidfile} /usr/bin/env ${procname} \
+                -config.file=${alertmanager_config} \
+                -storage.path=${alertmanager_data_dir} \
+                ${alertmanager_args} > ${alertmanager_log_file} 2>&1"
+
+start_precmd=alertmanager_startprecmd
+
+alertmanager_startprecmd()
+{
+    if [ ! -e ${pidfile} ]; then
+        install -o ${alertmanager_user} -g ${alertmanager_group} /dev/null ${pidfile};
+    fi
+    if [ ! -f "${alertmanager_log_file}" ]; then
+        install -o ${alertmanager_user} -g ${alertmanager_group} -m 640 /dev/null ${alertmanager_log_file};
+    fi
+    if [ ! -d ${alertmanager_data_dir} ]; then
+        install -d -o ${alertmanager_user} -g ${alertmanager_group} -m 750 ${alertmanager_data_dir}
+    fi
+}
+
+load_rc_config $name
+run_rc_command "$1"
diff --git a/net-mgmt/alertmanager/pkg-descr b/net-mgmt/alertmanager/pkg-descr
new file mode 100644
index 000000000000..c7b3744639d3
--- /dev/null
+++ b/net-mgmt/alertmanager/pkg-descr
@@ -0,0 +1,7 @@
+The Alertmanager handles alerts sent by client applications such
+as the Prometheus server. It takes care of deduplicating, grouping,
+and routing them to the correct receiver integrations such as email,
+PagerDuty, or OpsGenie. It also takes care of silencing and inhibition
+of alerts.
+
+WWW: https://prometheus.io/docs/alerting/alertmanager/