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This PR fixes the issue in #11353 ## New Env ```sh name = "ZO_HISTOGRAM_BREAKDOWN_FIELDS", help = "Comma-separated ordered list of stream fields used for stacked histogram breakdown. First match wins." default = "severity,log_level,level,status" ``` ## Flow Chart ``` UI histogram request (is_ui_histogram = true) │ ▼ ┌───────────────────────┐ │ is_multi_stream_search?│ └───────────────────────┘ │ yes │ no ▼ ▼ breakdown_field stream_names.first() = None │ │ ▼ │ infra::schema::get(org, stream, type) │ │ │ ┌──────┴──────┐ │ fails ok │ │ │ │ ▼ ▼ │ breakdown_field detect_histogram_breakdown_field(fields) │ = None │ │ priority scan (case-insensitive): │ 1. severity? ──yes──▶ breakdown_field = severity │ 2. log_level? ──yes──▶ breakdown_field = log_level │ 3. level? ──yes──▶ breakdown_field = level │ 4. status? ──yes──▶ breakdown_field = status │ 5. none match ──────▶ breakdown_field = None │ │ └──────────────────────────┘ │ ▼ convert_to_histogram_query(sql, streams, multi, breakdown_field) │ ┌────────────┴────────────┐ None Some(field) │ │ ▼ ▼ SELECT zo_sql_key, SELECT zo_sql_key, zo_sql_num "field" AS zo_sql_breakdown, FROM stream zo_sql_num WHERE ... FROM stream GROUP BY zo_sql_key WHERE ... ORDER BY zo_sql_key GROUP BY zo_sql_key, zo_sql_breakdown ORDER BY zo_sql_key │ │ └────────────┬─────────────┘ │ ▼ execute search │ ▼ Response { hits: [{ zo_sql_key, zo_sql_breakdown?, zo_sql_num }] histogram_breakdown_field: Option<String> } │ ┌────────────┴────────────┐ None Some(field) │ │ ▼ ▼ generateHistogramData() generateHistogramData() flat map: breakdown map: key → count (key, category) → count xData / yData breakdownSeries per category │ │ ▼ ▼ convertLogData() convertStackedLogData() single-series multi-series stacked ECharts options ECharts options + per-category color (palette) + scrollable legend │ │ ▼ ▼ flat bar chart stacked bar chart (unchanged) (one color per category) ``` --------- Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: bjp232004 <551527+bjp232004@users.noreply.github.com> Co-authored-by: Loakesh Indiran <66478092+Loaki07@users.noreply.github.com> Co-authored-by: Loakesh Indiran <rustyloaki@gmail.com>