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s3-exporter

Prometheus metrics exporter for S3 Storage

Config example

access_key: "optional-your-access-key"
secret_key: "optional-your-secret-key"
bucket: "bucket-name"
pattern: "*.zip"
folders:
  - "backup"
  - "nextcloudbackup"

You can omit access_key and secret_key to use credentials from environment settings, see the Boto3 documentation for more info.

If you would like metrics on objects in the root of the bucket use an empty folder, i.e.:

folders:
  - ""

Metrics

Metrics will be available at http://localhost:9327

# HELP s3_latest_file_timestamp Last modified timestamp(milliseconds) for latest file in folder
# TYPE s3_latest_file_timestamp gauge
s3_latest_file_timestamp{bucket="bucket-name",folder="backup"} 1519524066157.0
# HELP s3_oldest_file_timestamp Last modified timestamp(milliseconds) for oldest file in folder
# TYPE s3_oldest_file_timestamp gauge
s3_oldest_file_timestamp{bucket="bucket-name",folder="backup"} 1519005663854.0
# HELP s3_latest_file_size Size in bytes for latest file in folder
# TYPE s3_latest_file_size gauge
s3_latest_file_size{bucket="bucket-name",folder="backup"} 290355072.0
# HELP s3_oldest_file_size Size in bytes for latest file in folder
# TYPE s3_oldest_file_size gauge
s3_oldest_file_size{bucket="bucket-name",folder="backup"} 281699347.0
# HELP s3_file_count Numbeer of existing files in folder
# TYPE s3_file_count gauge
s3_file_count{bucket="bucket-name", folder="backup"} 7.0
# HELP s3_success Displays whether or not the listing of S3 was a success
# TYPE s3_success gauge
s3_success{bucket="bucket-name",folder="backup"} 1.0

Alert Example

  • Alert for time of latest backup. This example checks if backup is created every day (< 30h)
groups:
- name: host.rules
  rules:
  - alert: backup_is_too_old
    expr: (time()) - s3_latest_file_timestamp > 108000
    for: 5m
    labels:
      severity: critical
    annotations:
      description: Backup too old. Reported by instance {{ $labels.instance }}.
      summary: Backup too old
  • Alert for size of latest backup. This example checks latest backup file created has minimum size of 1MB
  - alert: backup_size_is_too_small
    expr: s3_latest_file_size < 1000000
    for: 5m
    labels:
      severity: critical
    annotations:
      description: Backup size too small. Reported by instance {{ $labels.instance }}.
      summary: Backup size too small

Run

Using code (local)

pip install -r app/requirements.txt
python app/exporter.py config/config.yml

Using docker

docker run -p 9327:9327 -v ./config:/config jamotion/s3-exporter

Using docker-compose

Currently the code will not be reloaded when it changes, so run the container interactively:

docker-compose run --service-ports s3

Then run the Python exporter process:

python exporter.py /config/config.yml