**_{_{}} Allow histogram configs when aggregation type is default**

[kingpope0120]

Allow histogram configs when aggregation type is default

The new validation in View now throws whenever AggregationType::kDefault is paired with a HistogramAggregationConfig. However, kDefault defers the actual aggregation choice to the instrument’s default (GetDefaultAggregationType returns kHistogram for histogram instruments). Existing callers can legitimately pass a histogram config while leaving the aggregation type at kDefault to customize bucket boundaries without overriding the default type; this change will now throw std::invalid_argument and prevent those views from being constructed. The check should accept histogram (and other concrete) config types when aggregation_type_ is kDefault because the concrete aggregation is resolved later based on the instrument descriptor.

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Originally posted by @chatgpt-codex-connector[bot] in #3732 (comment)