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• File src/s1gw_metrics.erl:

  • Patch Set #2, Line 85: -type counter() :: [ctr | _].

    can you explain this to me? it kind of matches tokens starting with ctr?

    Yes, exactly. It's basically the usual `[Head | Tail]` form, letting dialyzer know that the `Head` shall be `ctr` for counters and `gauge` for gauges. Try this in erlang shell:
     
    ```erlang
    6> [ctr | _] = [ctr, 1, 2, 3].
    [ctr,1,2,3]
    7> [ctr | _] = [gauge, 1, 2, 3].
    ** exception error: no match of right hand side value [gauge,1,2,3]
    ```

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