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s3_exporter

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Exports Prometheus metrics about S3 buckets and objects

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# AWS S3 Exporter

This exporter provides metrics for AWS S3 bucket objects by querying the API with a given bucket and prefix and constructing metrics based on the returned objects.

I find it useful for ensuring that backup jobs and batch uploads are functioning by comparing the growth in size/number of objects over time, or comparing the last modified date to an expected value.

## Building

```
make
```

## Running

```
./s3_exporter <flags>
```

You can query a bucket and prefix combination by supplying them as parameters to /probe:

```
curl localhost:9340/probe?bucket=some-bucket&prefix=some-folder/some-file.txt
```

### AWS Credentials

The exporter creates an AWS session without any configuration. You must specify credentials yourself as documented [here](https://docs.aws.amazon.com/sdk-for-go/v1/developer-guide/configuring-sdk.html).

Remember, if you want to load credentials from `~/.aws/config` then you need to to set:

```
export AWS_SDK_LOAD_CONFIG=true
```

### Docker

```
docker pull ribbybibby/s3-exporter
```

You will need to supply AWS credentials to the container, as mentioned in the previous section, either by setting the appropriate environment variables with `-e`, or by mounting your `~/.aws/` directory with `-v`.

```
# Environment variables
docker run -p 9340:9340 -e AWS_ACCESS_KEY_ID=<value> -e AWS_SECRET_ACCESS_KEY=<value> -e AWS_REGION=<value> s3-exporter:latest <flags>
# Mounted volume
docker run -p 9340:9340 -e AWS_SDK_LOAD_CONFIG=true -e HOME=/ -v $HOME/.aws:/.aws s3-exporter:latest <flags>
```

## Flags

```
  -h, --help                     Show context-sensitive help (also try --help-long and --help-man).
      --web.listen-address=":9340"
                                 Address to listen on for web interface and telemetry.
      --web.metrics-path="/metrics"
                                 Path under which to expose metrics
      --web.probe-path="/probe"  Path under which to expose the probe endpoint
      --web.discovery-path="/discovery"
                                 Path under which to expose service discovery
      --s3.endpoint-url=""       Custom endpoint URL
      --s3.disable-ssl           Custom disable SSL
      --s3.force-path-style      Custom force path style
      --log.level="info"         Only log messages with the given severity or above. Valid levels: [debug, info, warn, error, fatal]
      --log.format="logger:stderr"
                                 Set the log target and format. Example: "logger:syslog?appname=bob&local=7" or "logger:stdout?json=true"
      --version                  Show application version.
```

Flags can also be set as environment variables, prefixed by `S3_EXPORTER_`. For example: `S3_EXPORTER_S3_ENDPOINT_URL=http://s3.example.local`.

## Metrics

| Metric                             | Meaning                                                                                                     | Labels                    |
| ---------------------------------- | ----------------------------------------------------------------------------------------------------------- | ------------------------- |
| s3_biggest_object_size_bytes       | The size of the largest object.                                                                             | bucket, prefix            |
| s3_common_prefixes                 | A count of all the keys between the prefix and the next occurrence of the string specified by the delimiter | bucket, prefix, delimiter |
| s3_last_modified_object_date       | The modification date of the most recently modified object.                                                 | bucket, prefix            |
| s3_last_modified_object_size_bytes | The size of the object that was modified most recently.                                                     | bucket, prefix            |
| s3_list_duration_seconds           | The duration of the ListObjects operation                                                                   | bucket, prefix, delimiter |
| s3_list_success                    | Did the ListObjects operation complete successfully?                                                        | bucket, prefix, delimiter |
| s3_objects_size_sum_bytes          | The sum of the size of all the objects.                                                                     | bucket, prefix            |
| s3_objects                         | The total number of objects.                                                                                | bucket, prefix            |

## Common prefixes

Rather than generating metrics for the objects with a particular prefix, you can
set the `delimiter` parameter to produce a count of all the keys between the
prefix and the next occurrence of the given delimiter.

For instance:
```
$ curl 'localhost:9340/probe?bucket=registry-bucket&prefix=docker/registry/v2/blobs/sha256/&delimiter=/'
# HELP s3_common_prefixes A count of all the keys between the prefix and the next occurrence of the string specified by the delimiter
# TYPE s3_common_prefixes gauge
s3_common_prefixes{bucket="registry-bucket",delimiter="/",prefix="docker/registry/v2/blobs/sha256/"} 133
# HELP s3_list_duration_seconds The total duration of the list operation
# TYPE s3_list_duration_seconds gauge
s3_list_duration_seconds{bucket="registry-bucket",delimiter="/",prefix="docker/registry/v2/blobs/sha256/"} 0.921488535
# HELP s3_list_success If the ListObjects operation was a success
# TYPE s3_list_success gauge
s3_list_success{bucket="registry-bucket",delimiter="/",prefix="docker/registry/v2/blobs/sha256/"} 1
```

See [this
page](https://docs.aws.amazon.com/AmazonS3/latest/userguide/ListingKeysUsingAPIs.html)
for more information.

## Prometheus

### Configuration

You can pass the params to a single instance of the exporter using relabelling, like so:

```yml
scrape_configs:
  - job_name: "s3"
    metrics_path: /probe
    static_configs:
      - targets:
          - bucket=stuff;prefix=thing.txt;
          - bucket=other-stuff;prefix=another-thing.gif;
    relabel_configs:
      - source_labels: [__address__]
        regex: "^bucket=(.*);prefix=(.*);$"
        replacement: "${1}"
        target_label: "__param_bucket"
      - source_labels: [__address__]
        regex: "^bucket=(.*);prefix=(.*);$"
        replacement: "${2}"
        target_label: "__param_prefix"
      - target_label: __address__
        replacement: 127.0.0.1:9340 # S3 exporter.
```

### Service Discovery

Rather than defining a static list of buckets you can use the `/discovery` endpoint
in conjunction with HTTP service discovery to discover all the buckets the
exporter has access to.

This should be all the config required to successfully scrape every bucket:

```yml
scrape_configs:
  - job_name: "s3"
    metrics_path: /probe
    http_sd_configs:
      - url: http://127.0.0.1:9340/discovery
```

Use `relabel_configs` to select the buckets you want to scrape:

```yml
scrape_configs:
  - job_name: "s3"
    metrics_path: /probe
    http_sd_configs:
      - url: http://127.0.0.1:9340/discovery
    relabel_configs:
      # Keep buckets that start with example-
      - source_labels: [__param_bucket]
        action: keep
        regex: ^example-.*
```

The prefix can be set too, but be mindful that this will apply to all buckets:

```yml
scrape_configs:
  - job_name: "s3"
    metrics_path: /probe
    http_sd_configs:
      - url: http://127.0.0.1:9340/discovery
    params:
      prefix: ["thing.txt"]
```

### Example Queries

Return series where the last modified object date is more than 24 hours ago:

```
(time() - s3_last_modified_object_date) / 3600 > 24
```

s3_exporter

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