Exchange collector & Prometheus.erl update

What's new:

• Exchange collector exports message_stat:
  • rabbitmq_exchange_messages_published_total{vhost, exchange, type},
  • rabbitmq_exchange_messages_published_in_total{vhost, exchange, type},
  • rabbitmq_exchange_messages_published_out_total{vhost, exchange, type},
  • rabbitmq_exchange_messages_confirmed_total{vhost, exchange, type},
  • rabbitmq_exchange_messages_delivered_total{vhost, exchange, type},
  • rabbitmq_exchange_messages_delivered_no_ack_total{vhost, exchange, type},
  • rabbitmq_exchange_messages_get_total{vhost, exchange, type},
  • rabbitmq_exchange_messages_get_no_ack_total{vhost, exchange, type},
  • rabbitmq_exchange_messages_redelivered_total{vhost, exchange, type},
  • rabbitmq_exchange_messages_returned_total{vhost, exchange, type}
• Prometheus.erl updated
  • New system information collector;
  • Bug fixes.

Bugfix release for 3.6.5

Clustering fix, see #4.

RabbitMQ 3.6.5 Release

Features:

• Compatibility with RabbitMQ 3.6.5
• Process collector linux only
• Queue messages statistics
• Options
  • Can specify export format
  • Can customize scrape endpoint
  • Can customize queue messages stat metrics

Do not use! Bug fix release: https://github.com/deadtrickster/prometheus_rabbitmq_exporter/releases/tag/rabbitmq-3.6.5.2

First release compatible with RabbitMQ starting from 3.7

rabbitmq-3.7_1

use new version scheme

First release compatible with RabbitMQ 3.6

rabbitmq-3.6_2

add app metadata