In FastNetMon we have complete support for Prometheus based monitoring. It can be enabled this way (please do not use 0.0.0.0 for production setups and use private ranges for security reasons):

sudo fcli set main prometheus enable
sudo fcli set main prometheus_host 0.0.0.0
sudo fcli set main prometheus_port 9209
sudo fcli commit

After that, you will be able to access metrics via standard Prometheus interface from http://127.0.0.1:9209/metrics

FastNetMon exports all metrics which available using sudo fcli show system_counters command. Example:

# HELP Total number of simple packets processed
# TYPE total_simple_packets_processed counter
total_simple_packets_processed 2
# HELP Total number of IPv4 simple packets processed
# TYPE total_ipv4_packets counter
total_ipv4_packets 0
# HELP Total number of IPv6 simple packets processed
# TYPE total_ipv6_packets counter
total_ipv6_packets 2
# HELP Non IPv4 and non IPv6 packets
# TYPE unknown_ip_version_packets counter
unknown_ip_version_packets 0
# HELP Total number of packets we failed to parse
# TYPE total_unparsed_packets counter
total_unparsed_packets 0
# HELP Number of packets we fail to parse per second
# TYPE total_unparsed_packets_speed gauge
total_unparsed_packets_speed 0
# HELP Number of packets filtered with remote whitelist option
# TYPE total_remote_whitelisted_packets_packets counter
total_remote_whitelisted_packets_packets 0
# HELP Number of packets filtered by flow spec engine
# TYPE total_flowspec_filtered_packets counter
total_flowspec_filtered_packets 0
# HELP Number of bytes filtered by flow spec engine
# TYPE total_flowspec_filtered_bytes counter
total_flowspec_filtered_bytes 0
# HELP Number of packets white listed by flowspec whitelist
# TYPE total_flowspec_whitelist_packets counter
total_flowspec_whitelist_packets 0
# HELP Number of errors related with traffic db
# TYPE traffic_db_errors counter
traffic_db_errors 0
# HELP Number of messages pushed to traffic db
# TYPE traffic_db_pushed_messages counter
traffic_db_pushed_messages 0
# HELP Number of packets seen by sampler code
# TYPE traffic_db_sampler_seen_packets counter
traffic_db_sampler_seen_packets 0
# HELP Number of packets selected by sampler, only for mirror code
# TYPE traffic_db_sampler_selected_packets counter
traffic_db_sampler_selected_packets 0
# HELP Time consumed by recalculation for all IPs
# TYPE speed_recalculation_time_seconds gauge
speed_recalculation_time_seconds 0
# HELP Time consumed by recalculation for all IPs
# TYPE speed_recalculation_time_microseconds gauge
speed_recalculation_time_microseconds 49
# HELP Traffic calculation delay was shorter than we expected
# TYPE all_traffic_calculation_delay_shorter counter
all_traffic_calculation_delay_shorter 0
# HELP Traffic calculation delay was negative
# TYPE all_traffic_calculation_delay_negative counter
all_traffic_calculation_delay_negative 0
# HELP Traffic calculation delay longer then we expected
# TYPE all_traffic_calculation_delay_longer counter
all_traffic_calculation_delay_longer 0
# HELP Total number of hosts in our networks
# TYPE total_number_of_hosts gauge
total_number_of_hosts 257
# HELP IPv4 hosts hash load factor integer
# TYPE hosts_hash_load_factor_integer gauge
hosts_hash_load_factor_integer 0
# HELP IPv4 hosts hash load factor fraction
# TYPE hosts_hash_load_factor_fraction gauge
hosts_hash_load_factor_fraction 0
# HELP IPv4 hosts hash size
# TYPE hosts_hash_size gauge
hosts_hash_size 0
# HELP IPv4 hosts hash buckets number
# TYPE hosts_hash_bucket_count gauge
hosts_hash_bucket_count 1
# HELP IPv6 hosts hash load factor integer
# TYPE hosts_hash_load_factor_ipv6_integer gauge
hosts_hash_load_factor_ipv6_integer 0
# HELP IPv6 hosts hash load factor fraction
# TYPE hosts_hash_load_factor_ipv6_fraction gauge
hosts_hash_load_factor_ipv6_fraction 0
# HELP IPv6 hosts hash size
# TYPE hosts_hash_size_ipv6 gauge
hosts_hash_size_ipv6 0
# HELP IPv6 hosts hash buckets number
# TYPE hosts_hash_ipv6_bucket_count gauge
hosts_hash_ipv6_bucket_count 1
# HELP Total number of InfluxDB writes
# TYPE influxdb_writes_total counter
influxdb_writes_total 0
# HELP Total number of failed InfluxDB writes
# TYPE influxdb_writes_failed counter
influxdb_writes_failed 0
# HELP Total number of Clickhouse writes
# TYPE clickhouse_metrics_writes_total counter
clickhouse_metrics_writes_total 0
# HELP Total number of failed Clickhouse writes
# TYPE clickhouse_metrics_writes_failed counter
clickhouse_metrics_writes_failed 0
# HELP Number of IPFIX and Netflow per second
# TYPE netflow_all_protocols_total_flows_speed gauge
netflow_all_protocols_total_flows_speed 0
# HELP Number of sFlow headers per second
# TYPE sflow_raw_packet_headers_total_speed gauge
sflow_raw_packet_headers_total_speed 0
# HELP Number of entries in flow tracking structure
# TYPE entries_flow_tracking gauge
entries_flow_tracking 0
# HELP Number of IPs with flow information
# TYPE flow_exists_for_ip gauge
flow_exists_for_ip 0
# HELP Number of IPs without flow information
# TYPE flow_does_not_exist_for_ip gauge
flow_does_not_exist_for_ip 0
# HELP Traffic buffer for IPv4 maximum duration in seconds
# TYPE traffic_buffer_duration_seconds_ipv4 gauge
traffic_buffer_duration_seconds_ipv4 0
# HELP Traffic buffer for IPv6 maximum duration in seconds
# TYPE traffic_buffer_duration_seconds_ipv6 gauge
traffic_buffer_duration_seconds_ipv6 0
# HELP Number of IPv4 packets matched by flexible thresholds
# TYPE total_flexible_thresholds_matched_bytes_ipv4 counter
total_flexible_thresholds_matched_bytes_ipv4 0
# HELP Number of IPv4 bytes matched by flexible thresholds
# TYPE total_flexible_thresholds_matched_packets_ipv4 counter
total_flexible_thresholds_matched_packets_ipv4 0
# HELP Number of IPv6 bytes matched by flexible thresholds
# TYPE total_flexible_thresholds_matched_bytes_ipv6 counter
total_flexible_thresholds_matched_bytes_ipv6 0
# HELP Number of IPv6 packets matched by flexible thresholds
# TYPE total_flexible_thresholds_matched_packets_ipv6 counter
total_flexible_thresholds_matched_packets_ipv6 0
# HELP Number of raw packets received without any errors
# TYPE sflow_raw_udp_packets_received counter
sflow_raw_udp_packets_received 0
# HELP Number of failed receives
# TYPE sflow_udp_receive_errors counter
sflow_udp_receive_errors 0
# HELP Number of eagains
# TYPE sflow_udp_receive_eagain counter
sflow_udp_receive_eagain 1
# HELP Total number of received UDP sFlow packets
# TYPE sflow_total_packets counter
sflow_total_packets 0
# HELP Incorrectly crafted sFlow packets
# TYPE sflow_bad_packets counter
sflow_bad_packets 0
# HELP Number of flow samples, i.e. with packet headers
# TYPE sflow_flow_samples counter
sflow_flow_samples 0
# HELP Number of broken flow samples
# TYPE sflow_bad_flow_samples counter
sflow_bad_flow_samples 0
# HELP Number of packets with padding inside flow sample
# TYPE sflow_padding_flow_sample counter
sflow_padding_flow_sample 0
# HELP Number of packets where we have padding at the end of packet
# TYPE sflow_with_padding_at_the_end_of_packet counter
sflow_with_padding_at_the_end_of_packet 0
# HELP Number of packet headers from flow samples which could not be decoded correctly
# TYPE sflow_parse_error_nested_header counter
sflow_parse_error_nested_header 0
# HELP Number of counter samples, i.e. with port counters
# TYPE sflow_counter_sample counter
sflow_counter_sample 0
# HELP Number of packet headers from flow samples
# TYPE sflow_raw_packet_headers_total counter
sflow_raw_packet_headers_total 0
# HELP Number of samples with IPv4 packet headers
# TYPE sflow_ipv4_header_protocol counter
sflow_ipv4_header_protocol 0
# HELP Number of samples with IPv6 packet headers
# TYPE sflow_ipv6_header_protocol counter
sflow_ipv6_header_protocol 0
# HELP Number of packets for unknown header protocol
# TYPE sflow_unknown_header_protocol counter
sflow_unknown_header_protocol 0
# HELP Number of records with extended information from routers
# TYPE sflow_extended_router_data_records counter
sflow_extended_router_data_records 0
# HELP Number of samples with switch data
# TYPE sflow_extended_switch_data_records counter
sflow_extended_switch_data_records 0
# HELP Number of samples with gateway data
# TYPE sflow_extended_gateway_data_records counter
sflow_extended_gateway_data_records 0
# HELP Total number of Netflow v5 UDP packets received
# TYPE netflow_v5_total_packets counter
netflow_v5_total_packets 0
# HELP Total number of Netflow v5 flows (multiple in each packet)
# TYPE netflow_v5_total_flows counter
netflow_v5_total_flows 0
# HELP Netflow v5 flows with duration less then 15 seconds
# TYPE netflow_v5_duration_less_15_seconds counter
netflow_v5_duration_less_15_seconds 0
# HELP Netflow v5 flows with duration less then 30 seconds
# TYPE netflow_v5_duration_less_30_seconds counter
netflow_v5_duration_less_30_seconds 0
# HELP Netflow v5 flows with duration less then 60 seconds
# TYPE netflow_v5_duration_less_60_seconds counter
netflow_v5_duration_less_60_seconds 0
# HELP Netflow v5 flows with duration less then 90 seconds
# TYPE netflow_v5_duration_less_90_seconds counter
netflow_v5_duration_less_90_seconds 0
# HELP Netflow v5 flows with duration less then 180 seconds
# TYPE netflow_v5_duration_less_180_seconds counter
netflow_v5_duration_less_180_seconds 0
# HELP Netflow v5 flows with duration more then 180 seconds
# TYPE netflow_v5_duration_exceed_180_seconds counter
netflow_v5_duration_exceed_180_seconds 0
# HELP Total number of Netflow v5 UDP packets received
# TYPE netflow_v9_total_packets counter
netflow_v9_total_packets 0
# HELP Total number of Netflow v9 flows (multiple in each packet)
# TYPE netflow_v9_total_flows counter
netflow_v9_total_flows 0
# HELP Total number of Netflow v9 IPv4 flows (multiple in each packet)
# TYPE netflow_v9_total_ipv4_flows counter
netflow_v9_total_ipv4_flows 0
# HELP Total number of Netflow v9 IPv6 flows (multiple in each packet)
# TYPE netflow_v9_total_ipv6_flows counter
netflow_v9_total_ipv6_flows 0
# HELP Netflow v9 flows with duration less then 15 seconds
# TYPE netflow_v9_duration_less_15_seconds counter
netflow_v9_duration_less_15_seconds 0
# HELP Netflow v9 flows with duration less then 30 seconds
# TYPE netflow_v9_duration_less_30_seconds counter
netflow_v9_duration_less_30_seconds 0
# HELP Netflow v9 flows with duration less then 60 seconds
# TYPE netflow_v9_duration_less_60_seconds counter
netflow_v9_duration_less_60_seconds 0
# HELP Netflow v9 flows with duration less then 90 seconds
# TYPE netflow_v9_duration_less_90_seconds counter
netflow_v9_duration_less_90_seconds 0
# HELP Netflow v9 flows with duration less then 180 seconds
# TYPE netflow_v9_duration_less_180_seconds counter
netflow_v9_duration_less_180_seconds 0
# HELP Netflow v9 flows with duration more then 180 seconds
# TYPE netflow_v9_duration_exceed_180_seconds counter
netflow_v9_duration_exceed_180_seconds 0
# HELP Number of Netflow v9 data packets
# TYPE netflow_v9_data_packet_number counter
netflow_v9_data_packet_number 0
# HELP Number of Netflow v9 data template packets
# TYPE netflow_v9_data_templates_number counter
netflow_v9_data_templates_number 0
# HELP Number of Netflow v9 options templates packets
# TYPE netflow_v9_options_templates_number counter
netflow_v9_options_templates_number 0
# HELP Number of Netflow v9 options data packets
# TYPE netflow_v9_options_packet_number counter
netflow_v9_options_packet_number 0
# HELP Number of dropped Netflow v9 packets due to unknown template in message
# TYPE netflow_v9_packets_with_unknown_templates counter
netflow_v9_packets_with_unknown_templates 0
# HELP Number of times we received sampling rate from Netflow v9 agent
# TYPE netflow_v9_custom_sampling_rate_received counter
netflow_v9_custom_sampling_rate_received 0
# HELP How much times we changed sampling rate for same agent. As change we also count when we received it for the first time
# TYPE netflow_v9_sampling_rate_changes counter
netflow_v9_sampling_rate_changes 0
# HELP Number of Netflow v9 flows with re-classified protocol version
# TYPE netflow_v9_protocol_version_adjustments counter
netflow_v9_protocol_version_adjustments 0
# HELP Count times when template data actually changed for Netflow v9
# TYPE netflow_v9_template_updates_number_due_to_real_changes counter
netflow_v9_template_updates_number_due_to_real_changes 0
# HELP We increment these counters when field we use to store particular type of Netflow v9 record is smaller than we actually received from device
# TYPE netflow_v9_too_large_field counter
netflow_v9_too_large_field 0
# HELP Total number of headers in Netflow v9 lite received
# TYPE netflow_v9_lite_headers counter
netflow_v9_lite_headers 0
# HELP Number of Netflow v9 flows with forwarding status provided
# TYPE netflow_v9_forwarding_status counter
netflow_v9_forwarding_status 0
# HELP Netflow v9 Lite header parser errors
# TYPE netflow_v9_lite_header_parser_error counter
netflow_v9_lite_header_parser_error 0
# HELP Netflow v9 packets we cannot decode
# TYPE netflow_v9_broken_packets counter
netflow_v9_broken_packets 0
# HELP Total number of IPFIX flows (multiple in each packet)
# TYPE ipfix_total_flows counter
ipfix_total_flows 0
# HELP Total number of IPFIX UDP packets received
# TYPE ipfix_total_packets counter
ipfix_total_packets 0
# HELP Total number of IPFIX IPv4 flows (multiple in each packet)
# TYPE ipfix_total_ipv4_flows counter
ipfix_total_ipv4_flows 0
# HELP Total number of IPFIX IPv6 flows (multiple in each packet)
# TYPE ipfix_total_ipv6_flows counter
ipfix_total_ipv6_flows 0
# HELP IPFIX flows with duration less then 15 seconds
# TYPE ipfix_duration_less_15_seconds counter
ipfix_duration_less_15_seconds 0
# HELP IPFIX flows with duration less then 30 seconds
# TYPE ipfix_duration_less_30_seconds counter
ipfix_duration_less_30_seconds 0
# HELP IPFIX flows with duration less then 60 seconds
# TYPE ipfix_duration_less_60_seconds counter
ipfix_duration_less_60_seconds 0
# HELP IPFIX flows with duration less then 90 seconds
# TYPE ipfix_duration_less_90_seconds counter
ipfix_duration_less_90_seconds 0
# HELP IPFIX flows with duration less then 180 seconds
# TYPE ipfix_duration_less_180_seconds counter
ipfix_duration_less_180_seconds 0
# HELP IPFIX flows with duration more then 180 seconds
# TYPE ipfix_duration_exceed_180_seconds counter
ipfix_duration_exceed_180_seconds 0
# HELP IPFIX packets with negative duration, it may happen when vendor does not implement protocol correctly
# TYPE ipfix_duration_negative counter
ipfix_duration_negative 0
# HELP IPFIX flows finished by idle timeout
# TYPE ipfix_flows_end_reason_idle_timeout counter
ipfix_flows_end_reason_idle_timeout 0
# HELP IPFIX flows finished by active timeout
# TYPE ipfix_flows_end_reason_active_timeout counter
ipfix_flows_end_reason_active_timeout 0
# HELP IPFIX flows finished by end of flow timeout
# TYPE ipfix_flows_end_reason_end_of_flow_timeout counter
ipfix_flows_end_reason_end_of_flow_timeout 0
# HELP IPFIX flows finished by force end timeout
# TYPE ipfix_flows_end_reason_force_end_timeout counter
ipfix_flows_end_reason_force_end_timeout 0
# HELP IPFIX flows finished by lack of resources
# TYPE ipfix_flows_end_reason_lack_of_resource_timeout counter
ipfix_flows_end_reason_lack_of_resource_timeout 0
# HELP IPFIX data packets number
# TYPE ipfix_data_packet_number counter
ipfix_data_packet_number 0
# HELP IPFIX data templates number
# TYPE ipfix_data_templates_number counter
ipfix_data_templates_number 0
# HELP IPFIX options templates number
# TYPE ipfix_options_templates_number counter
ipfix_options_templates_number 0
# HELP IPFIX options data packets number
# TYPE ipfix_options_packet_number counter
ipfix_options_packet_number 0
# HELP Number of dropped IPFIX packets due to unknown template in message
# TYPE ipfix_packets_with_unknown_templates counter
ipfix_packets_with_unknown_templates 0
# HELP IPFIX customer sampling rates received
# TYPE ipfix_custom_sampling_rate_received counter
ipfix_custom_sampling_rate_received 0
# HELP How much times we changed sampling rate for same agent.  As change we also count when we received it for the first time
# TYPE ipfix_sampling_rate_changes counter
ipfix_sampling_rate_changes 0
# HELP IPFIX flow was marked as dropped from interface and next hop information
# TYPE ipfix_marked_zero_next_hop_and_zero_output_as_dropped counter
ipfix_marked_zero_next_hop_and_zero_output_as_dropped 0
# HELP Count times when template data actually changed for IPFIX
# TYPE ipfix_template_updates_number_due_to_real_changes counter
ipfix_template_updates_number_due_to_real_changes 0
# HELP Total number of IPFIX packets with padding
# TYPE ipfix_packets_with_padding counter
ipfix_packets_with_padding 0
# HELP Total number of headers in IPFIX received
# TYPE ipfix_inline_headers counter
ipfix_inline_headers 0
# HELP Number of IPFIX flows with re-classified protocol version
# TYPE ipfix_protocol_version_adjustments counter
ipfix_protocol_version_adjustments 0
# HELP We increment these counters when field we use to store particular type of IPFIX record is smaller than we actually received from device
# TYPE ipfix_too_large_field counter
ipfix_too_large_field 0
# HELP Number of IPFIX flows with forwarding status provided
# TYPE ipfix_forwarding_status counter
ipfix_forwarding_status 0
# HELP IPFIX inline header parser errors
# TYPE ipfix_inline_header_parser_error counter
ipfix_inline_header_parser_error 0
# HELP Total number of Netflow or IPFIX UDP packets received
# TYPE netflow_ipfix_total_packets counter
netflow_ipfix_total_packets 0
# HELP Total number of flows summarized for all kinds of Netflow and IPFIX
# TYPE netflow_ipfix_all_protocols_total_flows counter
netflow_ipfix_all_protocols_total_flows 0
# HELP Number of UDP packets dropped by system on our socket
# TYPE netflow_ipfix_udp_packet_drops counter
netflow_ipfix_udp_packet_drops 0
# HELP Number of packets with unknown Netflow version. In may be sign that some another protocol like sFlow is being send to Netflow or IPFIX port
# TYPE netflow_ipfix_unknown_protocol_version counter
netflow_ipfix_unknown_protocol_version 0
# HELP Number of templates received with same data as inside known by us
# TYPE template_update_attempts_with_same_template_data counter
template_update_attempts_with_same_template_data 0
# HELP Number of flows which exceed specified limit in configuration
# TYPE netflow_ignored_long_flows counter
netflow_ignored_long_flows 0
# HELP Number of times when we write Netflow or ipfix templates to disk
# TYPE template_netflow_ipfix_disk_writes counter
template_netflow_ipfix_disk_writes 0
# HELP Number of received packets
# TYPE af_packet_socket_received_packets counter
af_packet_socket_received_packets 2
# HELP Number of dropped packets
# TYPE af_packet_socket_dropped_packets counter
af_packet_socket_dropped_packets 0
# HELP Number of blocks we read from kernel, each block has multiple packets
# TYPE af_packet_blocks_read counter
af_packet_blocks_read 1
# HELP Number of packets read by AF_PACKET before parsing
# TYPE af_packet_packets_raw counter
af_packet_packets_raw 2
# HELP Number of parsed packets
# TYPE af_packet_packets_parsed counter
af_packet_packets_parsed 2
# HELP Number of not parsed packets
# TYPE af_packet_packets_unparsed counter
af_packet_packets_unparsed 0
# HELP System UDP counter ignoredmulti
# TYPE global_system_ignoredmulti counter
global_system_ignoredmulti 2252
# HELP System UDP counter incsumerrors
# TYPE global_system_incsumerrors counter
global_system_incsumerrors 0
# HELP System UDP counter indatagrams
# TYPE global_system_indatagrams counter
global_system_indatagrams 609
# HELP System UDP counter inerrors
# TYPE global_system_inerrors counter
global_system_inerrors 0
# HELP System UDP counter noports
# TYPE global_system_noports counter
global_system_noports 1
# HELP System UDP counter outdatagrams
# TYPE global_system_outdatagrams counter
global_system_outdatagrams 612
# HELP System UDP counter rcvbuferrors
# TYPE global_system_rcvbuferrors counter
global_system_rcvbuferrors 0
# HELP System UDP counter sndbuferrors
# TYPE global_system_sndbuferrors counter
global_system_sndbuferrors 0

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