# Amazon CloudWatch Statistics Input Plugin

This plugin will pull Metric Statistics from Amazon CloudWatch.

## Amazon Authentication

This plugin uses a credential chain for Authentication with the CloudWatch
API endpoint. In the following order the plugin will attempt to authenticate.

1. Assumed credentials via STS if `role_arn` attribute is specified
   (source credentials are evaluated from subsequent rules)
2. Explicit credentials from `access_key`, `secret_key`, and `token` attributes
3. Shared profile from `profile` attribute
4. [Environment Variables][env]
5. [Shared Credentials][credentials]
6. [EC2 Instance Profile][iam-roles]

## Configuration

```toml @sample.conf
# Pull Metric Statistics from Amazon CloudWatch
[[inputs.cloudwatch]]
  ## Amazon Region
  region = "us-east-1"

  ## Amazon Credentials
  ## Credentials are loaded in the following order
  ## 1) Web identity provider credentials via STS if role_arn and
  ##    web_identity_token_file are specified
  ## 2) Assumed credentials via STS if role_arn is specified
  ## 3) explicit credentials from 'access_key' and 'secret_key'
  ## 4) shared profile from 'profile'
  ## 5) environment variables
  ## 6) shared credentials file
  ## 7) EC2 Instance Profile
  # access_key = ""
  # secret_key = ""
  # token = ""
  # role_arn = ""
  # web_identity_token_file = ""
  # role_session_name = ""
  # profile = ""
  # shared_credential_file = ""

  ## Endpoint to make request against, the correct endpoint is automatically
  ## determined and this option should only be set if you wish to override the
  ## default.
  ##   ex: endpoint_url = "http://localhost:8000"
  # endpoint_url = ""

  ## Set http_proxy
  # use_system_proxy = false
  # http_proxy_url = "http://localhost:8888"

  ## The minimum period for Cloudwatch metrics is 1 minute (60s). However not
  ## all metrics are made available to the 1 minute period. Some are collected
  ## at 3 minute, 5 minute, or larger intervals.
  ## See https://aws.amazon.com/cloudwatch/faqs/#monitoring.
  ## Note that if a period is configured that is smaller than the minimum for a
  ## particular metric, that metric will not be returned by the Cloudwatch API
  ## and will not be collected by Telegraf.
  #
  ## Requested CloudWatch aggregation Period (required)
  ## Must be a multiple of 60s.
  period = "5m"

  ## Collection Delay (required)
  ## Must account for metrics availability via CloudWatch API
  delay = "5m"

  ## Recommended: use metric 'interval' that is a multiple of 'period' to avoid
  ## gaps or overlap in pulled data
  interval = "5m"

  ## Recommended if "delay" and "period" are both within 3 hours of request
  ## time. Invalid values will be ignored. Recently Active feature will only
  ## poll for CloudWatch ListMetrics values that occurred within the last 3h.
  ## If enabled, it will reduce total API usage of the CloudWatch ListMetrics
  ## API and require less memory to retain.
  ## Do not enable if "period" or "delay" is longer than 3 hours, as it will
  ## not return data more than 3 hours old.
  ## See https://docs.aws.amazon.com/AmazonCloudWatch/latest/APIReference/API_ListMetrics.html
  #recently_active = "PT3H"

  ## Configure the TTL for the internal cache of metrics.
  # cache_ttl = "1h"

  ## Metric Statistic Namespaces (required)
  namespaces = ["AWS/ELB"]
  ## Single metric statistic namespace appended to namespaces on startup
  # namespace = "AWS/ELB"

  ## Maximum requests per second. Note that the global default AWS rate limit
  ## is 50 reqs/sec, so if you define multiple namespaces, these should add up
  ## to a maximum of 50.
  ## See http://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/cloudwatch_limits.html
  # ratelimit = 25

  ## Timeout for http requests made by the cloudwatch client.
  # timeout = "5s"

  ## Batch Size
  ## The size of each batch to send requests to Cloudwatch. 500 is the
  ## suggested largest size. If a request gets to large (413 errors), consider
  ## reducing this amount.
  # batch_size = 500

  ## Namespace-wide statistic filters. These allow fewer queries to be made to
  ## cloudwatch.
  # statistic_include = ["average", "sum", "minimum", "maximum", sample_count"]
  # statistic_exclude = []

  ## Metrics to Pull
  ## Defaults to all Metrics in Namespace if nothing is provided
  ## Refreshes Namespace available metrics every 1h
  #[[inputs.cloudwatch.metrics]]
  #  names = ["Latency", "RequestCount"]
  #
  #  ## Statistic filters for Metric.  These allow for retrieving specific
  #  ## statistics for an individual metric.
  #  # statistic_include = ["average", "sum", "minimum", "maximum", sample_count"]
  #  # statistic_exclude = []
  #
  #  ## Dimension filters for Metric.
  #  ## All dimensions defined for the metric names must be specified in order
  #  ## to retrieve the metric statistics.
  #  ## 'value' has wildcard / 'glob' matching support such as 'p-*'.
  #  [[inputs.cloudwatch.metrics.dimensions]]
  #    name = "LoadBalancerName"
  #    value = "p-example"
```

## Requirements and Terminology

Plugin Configuration utilizes [CloudWatch concepts][concept] and access pattern to
allow monitoring of any CloudWatch Metric.

- `region` must be a valid AWS [region][] value
- `period` must be a valid CloudWatch [period][] value
- `namespace` must be a valid CloudWatch [namespace][] value
- `names` must be valid CloudWatch [metric][] names
- `dimensions` must be valid CloudWatch [dimension][] name/value pairs

Omitting or specifying a value of `'*'` for a dimension value configures all
available metrics that contain a dimension with the specified name to be
retrieved. If specifying >1 dimension, then the metric must contain *all* the
configured dimensions where the the value of the wildcard dimension is ignored.

Example:

```toml
[[inputs.cloudwatch]]
  period = "1m"
  interval = "5m"

  [[inputs.cloudwatch.metrics]]
    names = ["Latency"]

    ## Dimension filters for Metric (optional)
    [[inputs.cloudwatch.metrics.dimensions]]
      name = "LoadBalancerName"
      value = "p-example"

    [[inputs.cloudwatch.metrics.dimensions]]
      name = "AvailabilityZone"
      value = "*"
```

If the following ELBs are available:

- name: `p-example`, availabilityZone: `us-east-1a`
- name: `p-example`, availabilityZone: `us-east-1b`
- name: `q-example`, availabilityZone: `us-east-1a`
- name: `q-example`, availabilityZone: `us-east-1b`

Then 2 metrics will be output:

- name: `p-example`, availabilityZone: `us-east-1a`
- name: `p-example`, availabilityZone: `us-east-1b`

If the `AvailabilityZone` wildcard dimension was omitted, then a single metric
(name: `p-example`) would be exported containing the aggregate values of the ELB
across availability zones.

To maximize efficiency and savings, consider making fewer requests by increasing
`interval` but keeping `period` at the duration you would like metrics to be
reported. The above example will request metrics from Cloudwatch every 5 minutes
but will output five metrics timestamped one minute apart.

## Restrictions and Limitations

- CloudWatch metrics are not available instantly via the CloudWatch API.
  You should adjust your collection `delay` to account for this lag in metrics
  availability based on your [monitoring subscription level][using]
- CloudWatch API usage incurs cost - see [GetMetricData Pricing][pricing]

## Metrics

Each CloudWatch Namespace monitored records a measurement with fields for each
available Metric Statistic.  Namespace and Metrics are represented in [snake
case](https://en.wikipedia.org/wiki/Snake_case)

- cloudwatch_{namespace}
  - {metric}_sum         (metric Sum value)
  - {metric}_average     (metric Average value)
  - {metric}_minimum     (metric Minimum value)
  - {metric}_maximum     (metric Maximum value)
  - {metric}_sample_count (metric SampleCount value)

### Tags

Each measurement is tagged with the following identifiers to uniquely identify
the associated metric Tag Dimension names are represented in [snake
case](https://en.wikipedia.org/wiki/Snake_case)

- All measurements have the following tags:
  - region           (CloudWatch Region)
  - {dimension-name} (Cloudwatch Dimension value - one per metric dimension)

## Troubleshooting

You can use the aws cli to get a list of available metrics and dimensions:

```shell
aws cloudwatch list-metrics --namespace AWS/EC2 --region us-east-1
aws cloudwatch list-metrics --namespace AWS/EC2 --region us-east-1 --metric-name CPUCreditBalance
```

If the expected metrics are not returned, you can try getting them manually
for a short period of time:

```shell
aws cloudwatch get-metric-data \
  --start-time 2018-07-01T00:00:00Z \
  --end-time 2018-07-01T00:15:00Z \
  --metric-data-queries '[
  {
    "Id": "avgCPUCreditBalance",
    "MetricStat": {
      "Metric": {
        "Namespace": "AWS/EC2",
        "MetricName": "CPUCreditBalance",
        "Dimensions": [
          {
            "Name": "InstanceId",
            "Value": "i-deadbeef"
          }
        ]
      },
      "Period": 300,
      "Stat": "Average"
    },
    "Label": "avgCPUCreditBalance"
  }
]'
```

## Example Output

```shell
$ ./telegraf --config telegraf.conf --input-filter cloudwatch --test
> cloudwatch_aws_elb,load_balancer_name=p-example,region=us-east-1 latency_average=0.004810798017284538,latency_maximum=0.1100282669067383,latency_minimum=0.0006084442138671875,latency_sample_count=4029,latency_sum=19.382705211639404 1459542420000000000
```

[concept]: http://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/cloudwatch_concepts.html
[credentials]: https://docs.aws.amazon.com/sdk-for-go/v1/developer-guide/configuring-sdk.html#shared-credentials-file
[dimension]: http://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/cloudwatch_concepts.html#Dimension
[env]: https://docs.aws.amazon.com/sdk-for-go/v1/developer-guide/configuring-sdk.html#environment-variables
[iam-roles]: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/iam-roles-for-amazon-ec2.html
[metric]: http://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/cloudwatch_concepts.html#Metric
[namespace]: http://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/cloudwatch_concepts.html#Namespace
[period]: http://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/cloudwatch_concepts.html#CloudWatchPeriods
[pricing]: https://aws.amazon.com/cloudwatch/pricing/
[region]: http://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/cloudwatch_concepts.html#CloudWatchRegions
[using]: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-cloudwatch-new.html
