Update changelog

(cherry picked from commit dc4fa5dd9aa5876b6ba5022aab3d5453fecc7b2b)

CHANGELOG.md

@@ -1,3 +1,21 @@
+## v1.18.1 [2021-04-07]
+
+#### Bugfixes
+
+  - [#9082](https://github.com/influxdata/telegraf/pull/9082) `inputs.mysql` Fix 'binary logs' query for MySQL 8
+  - [#9069](https://github.com/influxdata/telegraf/pull/9069) `inputs.tail` Add configurable option for the 'path' tag override
+  - [#9067](https://github.com/influxdata/telegraf/pull/9067) `inputs.nfsclient` Fix integer overflow in fields from mountstat
+  - [#9050](https://github.com/influxdata/telegraf/pull/9050) `inputs.snmp` Fix init when no mibs are installed
+  - [#9072](https://github.com/influxdata/telegraf/pull/9072) `inputs.ping` Always call SetPrivileged(true) in native mode
+  - [#9043](https://github.com/influxdata/telegraf/pull/9043) `processors.ifname` Get interface name more effeciently
+  - [#9056](https://github.com/influxdata/telegraf/pull/9056) `outputs.yandex_cloud_monitoring` Use correct compute metadata URL to get folder-id
+  - [#9048](https://github.com/influxdata/telegraf/pull/9048) `outputs.azure_monitor` Handle error when initializing the auth object
+  - [#8549](https://github.com/influxdata/telegraf/pull/8549) `inputs.sqlserver` Fix sqlserver_process_cpu calculation
+  - [#9035](https://github.com/influxdata/telegraf/pull/9035) `inputs.ipmi_sensor` Fix panic
+  - [#9009](https://github.com/influxdata/telegraf/pull/9009) `inputs.docker` Fix panic when parsing container stats
+  - [#8333](https://github.com/influxdata/telegraf/pull/8333) `inputs.exec` Don't truncate messages in debug mode
+  - [#8769](https://github.com/influxdata/telegraf/pull/8769) `agent` Close running outputs when reloadinlg
+
 ## v1.18.0 [2021-03-17]
 
 #### Release Notes

etc/telegraf.conf

@@ -7949,6 +7949,9 @@
 #   ## https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_INPUT.md
 #   data_format = "influx"
 #
+#   ## Set the tag that will contain the path of the tailed file. If you don't want this tag, set it to an empty string.
+#   # path_tag = "path"
+#
 #   ## multiline parser/codec
 #   ## https://www.elastic.co/guide/en/logstash/2.4/plugins-filters-multiline.html
 #   #[inputs.tail.multiline]
@@ -8194,3 +8197,4 @@
 # [[inputs.zipkin]]
 #   # path = "/api/v1/spans" # URL path for span data
 #   # port = 9411            # Port on which Telegraf listens
+