host-metrics: telegraf config template

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

stack_orchestrator/data/config/host-metrics/telegraf.conf.tpl

@@ -0,0 +1,60 @@
+# host-metrics telegraf template.
+# Rendered at container start by telegraf-entrypoint.sh:
+#   - @@HOST_TAG_BLOCK@@ -> [global_tags] host = "<HOST_TAG>" if HOST_TAG set,
+#                          empty if unset (telegraf auto-tags with kernel hostname).
+#   - @@ZFS_BLOCK@@      -> [[inputs.zfs]] block if COLLECT_ZFS=true, else empty.
+# All ${...} variables are resolved by telegraf's native env substitution at
+# config-load time.
+
+@@HOST_TAG_BLOCK@@
+
+[agent]
+  interval = "${COLLECT_INTERVAL}"
+  round_interval = true
+  collection_jitter = "0s"
+  flush_interval = "${COLLECT_INTERVAL}"
+  flush_jitter = "0s"
+  precision = "0s"
+  hostname = ""
+  omit_hostname = false
+
+[[outputs.influxdb]]
+  urls = ["${INFLUXDB_URL}"]
+  database = "${INFLUXDB_DB}"
+  skip_database_creation = true
+  username = "${INFLUXDB_USER}"
+  password = "${INFLUXDB_PASSWORD}"
+  retention_policy = ""
+  write_consistency = "any"
+  timeout = "10s"
+
+[[inputs.cpu]]
+  percpu = false
+  totalcpu = true
+  collect_cpu_time = false
+  report_active = true
+
+[[inputs.mem]]
+
+[[inputs.swap]]
+
+[[inputs.system]]
+
+[[inputs.processes]]
+
+[[inputs.disk]]
+  ignore_fs = ["tmpfs", "devtmpfs", "devfs", "iso9660", "overlay",
+               "aufs", "squashfs", "nsfs", "tracefs", "proc", "sysfs",
+               "cgroup", "cgroup2", "fuse.lxcfs"]
+  mount_points = ["/hostfs"]
+
+[[inputs.diskio]]
+  device_tags = ["DEVNAME"]
+  skip_serial_number = true
+  name_templates = ["$DEVNAME"]
+
+[[inputs.net]]
+  ignore_protocol_stats = true
+  interfaces = ["eth*", "en*", "ens*", "eno*", "enp*", "wlan*"]
+
+@@ZFS_BLOCK@@