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Add support for complex counter values #260

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@bobrik bobrik commented Sep 3, 2023

This allows having a single map value to support multiple counters:

ivan@vm:~$ curl -s http://localhost:9435/metrics | fgrep block_rq
# HELP ebpf_exporter_block_rq_completed_bytes_total Total number of bytes served by block requests completions
# TYPE ebpf_exporter_block_rq_completed_bytes_total counter
ebpf_exporter_block_rq_completed_bytes_total{device="nvme0n1"} 258048
ebpf_exporter_block_rq_completed_bytes_total{device="nvme1n1"} 966656
# HELP ebpf_exporter_block_rq_completions_total Total number of block request completions
# TYPE ebpf_exporter_block_rq_completions_total counter
ebpf_exporter_block_rq_completions_total{device="nvme0n1"} 35
ebpf_exporter_block_rq_completions_total{device="nvme1n1"} 103
ebpf_exporter_ebpf_program_info{config="complex-value",id="72",program="block_rq_complete",tag="34d2100b313409cd"} 1

@bobrik bobrik marked this pull request as draft September 3, 2023 02:33
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bobrik commented Sep 3, 2023

I would like some numbers from #253 before moving this further.

This allows having a single map value to support multiple counters:

    ivan@vm:~$ curl -s http://localhost:9435/metrics | fgrep block_rq
    # HELP ebpf_exporter_block_rq_completed_bytes_total Total number of bytes served by block requests completions
    # TYPE ebpf_exporter_block_rq_completed_bytes_total counter
    ebpf_exporter_block_rq_completed_bytes_total{device="nvme0n1"} 258048
    ebpf_exporter_block_rq_completed_bytes_total{device="nvme1n1"} 966656
    # HELP ebpf_exporter_block_rq_completions_total Total number of block request completions
    # TYPE ebpf_exporter_block_rq_completions_total counter
    ebpf_exporter_block_rq_completions_total{device="nvme0n1"} 35
    ebpf_exporter_block_rq_completions_total{device="nvme1n1"} 103
    ebpf_exporter_ebpf_program_info{config="complex-value",id="72",program="block_rq_complete",tag="34d2100b313409cd"} 1
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