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7c66bb5497
Replaced the static key-value attribute storage in update-form instruments with sample-evaluated attributes, matching the log-record attr change. The 'attr' keyword now accepts a key and a HAProxy sample expression evaluated at runtime. The struct (conf.h) changed from otelc_kv/attr_len to a list of flt_otel_conf_sample entries. The parser (parser.c) calls flt_otel_parse_cfg_sample() with n=1 per attr keyword. At runtime (event.c) each attribute is evaluated via flt_otel_sample_eval() and added via flt_otel_sample_add_kv() to a bare flt_otel_scope_data_kv, which is passed to the meter. Updated documentation, debug macro and test configurations.