feat(processors.aws_ec2): Allow to use instance metadata (influxdata#…

…15795)

plugins/processors/aws_ec2/README.md

@@ -37,7 +37,7 @@ See the [CONFIGURATION.md][CONFIGURATION.md] for more details.
   ## * ramdiskId
   ## * region
   ## * version
-  imds_tags = []
+  # imds_tags = []
 
   ## EC2 instance tags retrieved with DescribeTags action.
   ## In case tag is empty upon retrieval it's omitted when tagging metrics.
@@ -47,23 +47,35 @@ See the [CONFIGURATION.md][CONFIGURATION.md] for more details.
   ##
   ## For more information see:
   ## https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_DescribeTags.html
-  ec2_tags = []
+  # ec2_tags = []
+
+  ## Paths to instance metadata information to attach to the metrics.
+  ## Specify the full path without the base-path e.g. `tags/instance/Name`.
+  ##
+  ## For more information see:
+  ## https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-metadata.html
+  # metadata_paths = []
+
+  ## Allows to convert metadata tag-names to canonical names representing the
+  ## full path with slashes ('/') being replaces with underscores. By default,
+  ## only the last path element is used to name the tag.
+  # canonical_metadata_tags = false
 
   ## Timeout for http requests made by against aws ec2 metadata endpoint.
-  timeout = "10s"
+  # timeout = "10s"
 
   ## ordered controls whether or not the metrics need to stay in the same order
   ## this plugin received them in. If false, this plugin will change the order
   ## with requests hitting cached results moving through immediately and not
   ## waiting on slower lookups. This may cause issues for you if you are
   ## depending on the order of metrics staying the same. If so, set this to true.
   ## Keeping the metrics ordered may be slightly slower.
-  ordered = false
+  # ordered = false
 
   ## max_parallel_calls is the maximum number of AWS API calls to be in flight
   ## at the same time.
   ## It's probably best to keep this number fairly low.
-  max_parallel_calls = 10
+  # max_parallel_calls = 10
 
   ## cache_ttl determines how long each cached item will remain in the cache before
   ## it is removed and subsequently needs to be queried for from the AWS API. By