Add minimum version for new plugins (#7810)

plugins/inputs/nginx_sts/README.md

@@ -7,6 +7,8 @@ status such as servers, upstreams, caches. This is similar to the live activity
 monitoring of Nginx plus.  For module configuration details please see its
 [documentation](https://github.com/vozlt/nginx-module-sts#synopsis).
 
+Telegraf minimum version: Telegraf 1.15.0
+
 ### Configuration
 
 ```toml

plugins/inputs/redfish/README.md

@@ -2,6 +2,7 @@
 
 The `redfish` plugin gathers  metrics and status information about CPU temperature, fanspeed, Powersupply, voltage, hostname and Location details(datacenter,placement,rack and room) of hardware servers for which redfish is enabled.
 
+Telegraf minimum version: Telegraf 1.15.0
 
 ### Configuration
 

plugins/outputs/execd/README.md

@@ -2,6 +2,8 @@
 
 The `execd` plugin runs an external program as a daemon.
 
+Telegraf minimum version: Telegraf 1.15.0
+
 ### Configuration:
 
 ```toml
@@ -23,4 +25,4 @@ The `execd` plugin runs an external program as a daemon.
 
 see [examples][]
 
-[examples]: https://github.com/influxdata/telegraf/blob/master/plugins/outputs/execd/examples/
+[examples]: https://github.com/influxdata/telegraf/blob/master/plugins/outputs/execd/examples/

plugins/outputs/newrelic/README.md

@@ -4,6 +4,8 @@ This plugins writes to New Relic Insights using the [Metrics API][].
 
 To use this plugin you must first obtain an [Insights API Key][].
 
+Telegraf minimum version: Telegraf 1.15.0
+
 ### Configuration
 ```toml
 [[outputs.newrelic]]

plugins/processors/defaults/README.md

@@ -7,7 +7,9 @@ There are three cases where this processor will insert a configured default fiel
 1. The field is nil on the incoming metric
 1. The field is not nil, but its value is an empty string.
 1. The field is not nil, but its value is a string of one or more empty spaces.
-    
+
+Telegraf minimum version: Telegraf 1.15.0
+
 ### Configuration
 ```toml
 ## Set default fields on your metric(s) when they are nil or empty

plugins/processors/execd/README.md

@@ -7,6 +7,8 @@ metrics in influx line protocol to standard output (STDOUT).
 
 Program output on standard error is mirrored to the telegraf log.
 
+Telegraf minimum version: Telegraf 1.15.0
+
 ### Caveats
 
 - Metrics with tracking will be considered "delivered" as soon as they are passed

plugins/processors/filepath/README.md

@@ -22,7 +22,9 @@ stored in a new tag or field.
 
 If you plan to apply multiple transformations to the same `tag`/`field`, bear in mind the processing order stated above.
 
-## Configuration
+Telegraf minimum version: Telegraf 1.15.0
+
+### Configuration
 
 ```toml
 [[processors.filepath]]
@@ -56,9 +58,9 @@ If you plan to apply multiple transformations to the same `tag`/`field`, bear in
   #   tag = "path"
 ```
 
-## Considerations
+### Considerations
 
-### Clean
+#### Clean
 
 Even though `clean` is provided a standalone function, it is also invoked when using the `rel` and `dirname` functions,
 so there is no need to use it along with them.
@@ -81,13 +83,13 @@ Is equivalent to:
      tag = "path"
  ```
 
-### ToSlash
+#### ToSlash
 
 The effects of this function are only noticeable on Windows platforms, because of the underlying golang implementation.
 
-## Examples
+### Examples
 
-### Basename
+#### Basename
  
 ```toml
 [[processors.filepath]]
@@ -100,7 +102,7 @@ The effects of this function are only noticeable on Windows platforms, because o
 + my_metric,path="ajob.log" duration_seconds=134 1587920425000000000
 ```
 
-### Dirname
+#### Dirname
 
 ```toml
 [[processors.filepath]]
@@ -114,7 +116,7 @@ The effects of this function are only noticeable on Windows platforms, because o
 + my_metric path="/var/log/batch/ajob.log",folder="/var/log/batch",duration_seconds=134 1587920425000000000
 ```
 
-### Stem
+#### Stem
 
 ```toml
 [[processors.filepath]]
@@ -127,7 +129,7 @@ The effects of this function are only noticeable on Windows platforms, because o
 + my_metric,path="ajob" duration_seconds=134 1587920425000000000
 ```
 
-### Clean
+#### Clean
 
 ```toml
 [[processors.filepath]]
@@ -140,7 +142,7 @@ The effects of this function are only noticeable on Windows platforms, because o
 + my_metric,path="/var/log/batch/ajob.log" duration_seconds=134 1587920425000000000
 ```
 
-### Rel
+#### Rel
 
 ```toml
 [[processors.filepath]]
@@ -154,7 +156,7 @@ The effects of this function are only noticeable on Windows platforms, because o
 + my_metric,path="batch/ajob.log" duration_seconds=134 1587920425000000000
 ```
 
-### ToSlash
+#### ToSlash
 
 ```toml
 [[processors.filepath]]

plugins/processors/ifname/README.md

@@ -2,6 +2,8 @@
 
 The `ifname` plugin looks up network interface names using SNMP.
 
+Telegraf minimum version: Telegraf 1.15.0
+
 ### Configuration:
 
 ```toml

plugins/processors/port_name/README.md

@@ -4,6 +4,8 @@ Use the `port_name` processor to convert a tag containing a well-known port numb
 
 Tag can contain a number ("80") or number and protocol separated by slash ("443/tcp"). If protocol is not provided it defaults to tcp but can be changed with the default_protocol setting.
 
+Telegraf minimum version: Telegraf 1.15.0
+
 ### Configuration
 
 ```toml

plugins/processors/reverse_dns/README.md

@@ -3,6 +3,8 @@
 The `reverse_dns` processor does a reverse-dns lookup on tags (or fields) with
 IPs in them.
 
+Telegraf minimum version: Telegraf 1.15.0
+
 ### Configuration:
 
 ```toml

plugins/processors/starlark/README.md

@@ -13,6 +13,8 @@ files or sockets.
 The Starlark [specification][] has details about the syntax and available
 functions.
 
+Telegraf minimum version: Telegraf 1.15.0
+
 ### Configuration
 
 ```toml