Instrument several events in the eBPF agent:

• Counter of eBPF hashmap evictions
• Counter of userspace accounter evictions
• Counter of how many flows have been evicted on each eviction (for eBPF map and userspace map, as different counters)
• Counter of flows received via ringbuffer
• Counter of map evictions that are triggered after receiving a flow via ringbuffer
• Time spent by lookupAndDeleteMapKeysValues method
• Bytes submitted via gRPC or Kafka
• Sampling gauge (tracks sampling setting)

Instrument also counters for errors:

• Can't write into gRPC
• Can't write into kafka
• Reading Ringbuffer
• Can't delete flow entries
• Error iterating ebpf hashmap

Also provide a way to configure prometheus metrics export via HTTP (optionally disabled)