Unable to fetch metrics from Rabbit exporter

[Suprbizho]

Hello,

Issue: unable to retrieve RabbitMQ metrics.
Tried to "curl" the metrics endpoint from the localhost and after 1 minute i'm receiving the following output:

curl http://127.0.0.1:15672/api/metrics
curl: (52) Empty reply from server

Same print is shown within prometheus target list (increased the timeout to 2 minutes)

Tried to run with the latest available exporter version - same result

The problem began with the addition of additional queues and exchangers on the rabbit server.( currently holding about 4k queues and exchanges)

Env: RabbitMQ (3.7.15 Erlang 21.0) 2 node cluster running on ubuntu
Installed & enabled plugins:
[E*] prometheus_rabbitmq_exporter 3.7.2.4 / 3.7.9.1
[E*] rabbitmq_delayed_message_exchange 20171201-3.7.x
[e*] rabbitmq_management 3.7.15
[e*] rabbitmq_management_agent 3.7.15
[E*] rabbitmq_message_timestamp 3.8.0

Please advise.