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AWS EBS Snapshots and Volumes metrics exporter for Prometheus

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# EBS Exporter for Prometheus

## Overview

Export Prometheus metrics for AWS EBS Snapshots and Volumes:

* EBS Snapshot Start Time: `ebs_snapshots_start_time`
* EBS Snapshot Volume Size: `ebs_snapshots_volume_size`
* EBS Snapshots Total: `ebs_snapshots_total`
* EBS Volumes IOPS Credits (BurstBalance): `ebs_volume_iops_credit`
* EBS Volumes Status (In-use/Available): `ebs_volume_status`
* EBS Volumes Total: `ebs_volume_total`
* EBS Volumes Type Total; `ebs_volume_type_total`
* EBS Volumes Usage Status Total: `ebs_volume_usage_status_total`

## Getting Started

To get started, copy `config.toml.example` to `config.toml`. If you have `awscli` configured on your system, the AWS Go SDK will automatically fetch the credentials from your environment. If you would like to use other credentials, you'll need to set the `access_key` and `secret_key` inside `config.toml`.

If you want to scrape data from across AWS Accounts, you will also need to set `role_arn` to the IAM Role ARN of the assumed role.

The `region` needs to be set to the AWS region for which the data needs to be fetched.

### Required IAM Permissions

For the exporter to work, your IAM User/Role needs to have the following IAM Permissions attached:

```json
{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "VisualEditor0",
            "Effect": "Allow",
            "Action": [
                "cloudwatch:ListMetrics",
                "cloudwatch:GetMetricsData",
                "ec2:DescribeSnapshotAttribute",
                "ec2:DescribeSnapshots",
                "ec2:DescribeImportSnapshotTasks",
                "ec2:DescribeVolumes"
            ],
            "Resource": "*"
        }
    ]
}
```

### Configuration

`ebs-exporter` supports exporting data from multiple AWS accounts. For this, you need to create an entry for the account inside `config.toml`:

```toml
[[jobs]]
name        = ""
[jobs.aws]
access_key = ""
secret_key = ""
region     = "ap-south-1"
role_arn   = ""
[jobs.filters]
name  = ""
value = ""
[jobs.tags]
tag          = "ec2-tagname"
exported_tag = "ec2_tagname"
```

`[jobs.aws]` holds the credentials for the AWS account, and can be added per job. If no `access_key` and `secret_key` is specified, the exporter uses the default credentials configured by `awscli`.

**(Optional)** `[jobs.filters]` contains the filter tags to be applied while fetching EBS volumes. The `name` of the tag needs to be in the format `tag:tag-name`.

**(Optional)** `[jobs.tags]` contains AWS Tags to search for (`tag`), and its corresponding tag name to be exported as in the metric (`exported_tag`).

## Installation

### Precompiled Binaries

To download and use precompiled binaries for GNU/Linux, MacOS, and Windows, head over to the [releases page](https://git.maych.in/thunderbottom/ebs-exporter/releases).

### Docker Installation

To locally build and run the docker image, make sure you have edited `config.toml` before running:

```shell
$ docker build -t ebs-exporter -f docker/Dockerfile .
$ docker run -p 9980:9980 -v config.toml:/config.toml ebs-exporter
```

If you do not want to build your own docker image:

```shell
$ docker run -p 9980:9980 -v config.toml:/config.toml thunderbottom/ebs-exporter
```

### Compiling the Binary

```shell
$ git clone git@github.com:thunderbottom/ebs-exporter.git
$ cd ebs-exporter
$ make dist
$ cp config.toml.example config.toml
$ ./ebs-exporter -c config.toml
```

## Advanced

### Setting Up Prometheus

Add the following configuration to Prometheus:

```yaml
- job_name: 'ebs-exporter'
  metrics_path: '/metrics'
  static_configs:
  - targets: ['localhost:9980']
    labels:
      service: ebs-exporter
```

### Adding more exporters

Extending the functionality of this exporter is easy. Just make sure that your client implements the `Collect()` method, and then append it to the `initClients` method. You may look at the existing exporter client (`ec2.go`) for a sample implementation.

## Contributions

PRs for feature requests, bug fixes are welcome. Feel free to open an issue for bugs and discussions on the exporter functionality.

## License

```
MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
```

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