[Aliaksei-Kharlap]

Summary

chronos_forecasting 1.0.0: the reference implementation of the shared forecasting interface for InfluxDB 3 Explorer.
The request, response, errors and stored rows change, so this is a major release.

• Forecast a measurement field, or the result of any SQL query, from any database (source_database)
• tag_filter, sql_filter, group_by; every series goes to one model call
• series_limit with series_total in every response; results come in a stable order
• History: window, point_limit, sampling_interval, a bounded default window; history laid on a regular grid; a series mixing tag sets that write at the same time is refused
• Horizon as horizon_steps or horizon_duration, capped by max_forecast_points; levels give lower_<percent> / upper_<percent>
• On-demand backtest (backtest_points): coverage per level and MAE, in the same model call
• Settings from env, trigger arguments, TOML, request body, headers and query string (influxdata-plugin-utils); unknown keys are refused
• Error codes with HTTP statuses (400 / 500 / 503); too_few_points per series
• Stored rows carry points_read, run_time and an optional forecast_id tag
• Shared model cache with load locking and LRU, safe under concurrent runs; the model loads only when a series can be forecast
• forecast_interface.json manifest for Explorer; new dependency influxdata-plugin-utils>=0.5.0
• README split by trigger type; TOML templates for the scheduled and HTTP triggers; metadata with http_body_config

Breaking changes from 0.1.x

• Renamed keys: table/measurement → source_measurement, where_clause → sql_filter, tag_values → tag_filter, context_limit → point_limit, agg_interval →
  sampling_interval, horizon → horizon_steps, model_id → model
• The response is results[] per series × field; point key median → forecast
• A horizon is required; unknown keys are refused; errors answer with HTTP 4xx/5xx
• Stored rows: the full model id, a source_measurement tag, no mode tag

Testing

• Live test plan of 227 cases on InfluxDB 3.12.1 Enterprise: all pass
• influxdb3-plugin package (SDK 0.6.0): OK; the artifact includes `forecast_interface.json

Closes #184
Closes #185 (items 1–5; the CPU build of PyTorch cannot be chosen through install_packages)
Refs #186, influxdata/influxdb3_ui#1817