Release source code not found warnings for prometheus dependency

[albsch]

rebar3 release generates the following warnings:

❯ ./rebar3 release
===> Verifying dependencies...
===> Analyzing applications...
===> Compiling vectorclock
===> Compiling antidote_crdt
===> Compiling antidote_stats
===> Compiling antidote_pb_codec
===> Compiling antidotec_pb
===> Compiling antidote
===> Assembling release antidote-0.2.2...
===> Warnings generating release:
*WARNING* prometheus: Source code not found: prometheus_boolean.erl
*WARNING* prometheus: Source code not found: prometheus_counter.erl
*WARNING* prometheus: Source code not found: prometheus_gauge.erl
*WARNING* prometheus: Source code not found: prometheus_histogram.erl
*WARNING* prometheus: Source code not found: prometheus_http.erl
*WARNING* prometheus: Source code not found: prometheus_mnesia.erl
*WARNING* prometheus: Source code not found: prometheus_mnesia_collector.erl
*WARNING* prometheus: Source code not found: prometheus_model.erl
*WARNING* prometheus: Source code not found: prometheus_model_helpers.erl
*WARNING* prometheus: Source code not found: prometheus_protobuf_format.erl
*WARNING* prometheus: Source code not found: prometheus_quantile_summary.erl
*WARNING* prometheus: Source code not found: prometheus_summary.erl
*WARNING* prometheus: Source code not found: prometheus_test_instrumenter.erl
*WARNING* prometheus: Source code not found: prometheus_text_format.erl
*WARNING* prometheus: Source code not found: prometheus_vm_dist_collector.erl
*WARNING* prometheus: Source code not found: prometheus_vm_memory_collector.erl
*WARNING* prometheus: Source code not found: prometheus_vm_msacc_collector.erl
*WARNING* prometheus: Source code not found: prometheus_vm_statistics_collector.erl
*WARNING* prometheus: Source code not found: prometheus_vm_system_info_collector.erl
*WARNING* public_key: Source code not found: 'OTP-PUB-KEY'.erl
*WARNING* public_key: Source code not found: 'PKCS-FRAME'.erl
===> Release successfully assembled: _build/default/rel/antidote

The files are included in the release though, the release is working fine, and metrics collection is working. Figure out why the warnings are created.