feat(transform): add transform stats collector - #1197
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Add a new default-disabled `transform` collector that queries /_transform/_all/_stats and exposes per-transform metrics labeled by id: state and health_status (one-hot gauges), indexer counters (documents/pages/index/search/processing/delete, failures), exponential average gauges, and checkpoint/operations_behind progress gauges. health is parsed as a pointer so pre-8.x clusters that omit the block don't report a false "unknown". Includes a fixture-backed test, README flag/privilege rows, and metrics.md documentation. Signed-off-by: Povilas Vaitkus <povilas.vaitkus@hostinger.com>
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Add a new default-disabled
transformcollector that queries /_transform/_all/_stats and exposes per-transform metrics labeled by id: state and health_status (one-hot gauges), indexer counters (documents/pages/index/search/processing/delete, failures), exponential average gauges, and checkpoint/operations_behind progress gauges.health is parsed as a pointer so pre-8.x clusters that omit the block don't report a false "unknown".
Includes a fixture-backed test, README flag/privilege rows, and metrics.md documentation.