presto-verifier/src/main/java/io/prestosql/verifier/VerifierConfig.java/VerifierConfig/setEventClients
class VerifierConfig:    @ConfigDescription("The event client(s) to log the results to")
    @Config("event-client")
    public VerifierConfig setEventClients(String eventClients)
    {
        requireNonNull(eventClients, "eventClients is null");
        ImmutableSet.Builder<String> builder = ImmutableSet.builder();
        for (String value : Splitter.on(',').trimResults().omitEmptyStrings().split(eventClients)) {
            builder.add(value);
        }

        this.eventClients = builder.build();
        return this;
    }