Add monitor-postgrest local check

checkmk/custom-files/local/monitor-postgrest

+#!/usr/bin/env bash
+
+instance_names=()
+instance_admin_ports=()
+{% for instance_name, instance_conf in instances.items() %}
+instance_names+=("{{ instance_name }}")
+instance_admin_ports+=("{{ instance_conf['config']['admin-server-port'] }}")
+{% endfor %}
+
+function check_endpoint() {
+    admin_port="$1"
+    endpoint="$2"
+
+    url="127.0.0.1:$admin_port/$endpoint"
+    response=$(wget --quiet --spider --server-response --output-document - "$url" 2>&1)
+    wget_exit_code=$?
+    if [ $wget_exit_code -ne 0 ]; then
+        return $wget_exit_code
+    fi
+    status_code=$(awk 'NR==1{print $2}' <<<"$response")
+    echo "$status_code"
+}
+
+function get_status_detail() {
+    status_code="$1"
+    good="$2"
+    bad="$3"
+
+    if [ "$status_code" = 200 ]; then
+        echo "$good"
+    else
+        echo "$bad"
+    fi
+}
+
+function get_checkmk_status() {
+    status_codes=("$@")
+
+    for code in "${status_codes[@]}"; do
+        if [ "$code" != 200 ]; then
+            echo 2
+            return
+        fi
+    done
+    echo 0
+}
+
+function crit_on_non_zero() {
+    instance_name="$1"
+    exit_code="$2"
+
+    if [ "$exit_code" != 0 ]; then
+        echo "2 \"$instance_name PostgREST Status\" - Failed to connect (wget exit code: $exit_code)"
+        exit 0
+    fi
+}
+
+function check_instance() {
+    instance_name="$1"
+    instance_port="$2"
+
+    live_status_code=$(check_endpoint "$instance_port" "live")
+    crit_on_non_zero "$instance_name" $?
+    ready_status_code=$(check_endpoint "$instance_port" "ready")
+    crit_on_non_zero "$instance_name" $?
+
+    status_codes=("$live_status_code" "$ready_status_code")
+    checkmk_status=$(get_checkmk_status "${status_codes[@]}")
+
+    live_status_detail=$(get_status_detail "$live_status_code" "running" "dead")
+    ready_status_detail=$(get_status_detail "$ready_status_code" "correct" "invalid")
+
+    checkmk_status_detail="PostgREST $live_status_detail (status: $live_status_code)"
+    checkmk_status_detail+=", internal state $ready_status_detail (status: $ready_status_code)"
+
+    echo "$checkmk_status \"$instance_name PostgREST Status\" - $checkmk_status_detail"
+}
+
+for i in "${!instance_names[@]}"; do
+    check_instance "${instance_names[$i]}" "${instance_admin_ports[$i]}"
+done

checkmk/debian/monitor_postgrest.sls

+{% set instances = salt['pillar.get']("postgrest:instances") %}
+
+hsh_checkmk_monitor_postgrest_plugin:
+  file.managed:
+    - name: /usr/lib/check_mk_agent/local/monitor-postgrest
+    - source: salt://checkmk/custom-files/local/monitor-postgrest
+    - template: jinja
+    - context:
+      instances: {{ instances }}
+    - mode: 755
+    - user: root
+    - group: root