Prometheus Stream Ingest Metrics

Metric Name	Type	Components	Purpose
`hdx_sink_backlog_dropped_bytes_count`	Counter	Intake head	Total bytes of partition buckets dropped due to backlog growing too big. Only produced when `intake_head_index_backlog_enabled` is `true`.
`hdx_sink_backlog_dropped_items_count`	Counter	Intake head	Count of partition buckets dropped due to backlog growing too big. Only produced when `intake_head_index_backlog_enabled` is `true`.
`hdx_sink_backlog_delivery_count`	Counter	Intake head	Count of backlog buckets successfully handed off to indexing. Only produced when `intake_head_index_backlog_enabled` is `true`.
`http_source_byte_count`	Counter	Stream head	Count of bytes processed.
`http_source_request_count`	Counter	Stream head	Count of http requests.
`http_source_request_error_count`	Counter	Stream head	Count of http request failures.
`http_source_row_count`	Counter	Stream head	Count of rows processed.
`http_source_value_count`	Counter	Stream head	Count of values processed.
`kinesis_source_byte_count`	Counter	Stream peer	Count of bytes read from Kinesis.
`kinesis_source_checkpoint_count`	Counter	Stream peer	Count of Kinesis checkpoint operations.
`kinesis_source_checkpoint_error_count`	Counter	Stream peer	Count of errors in Kinesis checkpoint operations.
`kinesis_source_error_count`	Counter	Stream peer	Count of errors in Kinesis source reads.
`kinesis_source_operation_count`	Counter	Stream peer	Count of operations on Kinesis.
`kinesis_source_record_count`	Counter	Stream peer	Count of records read from Kinesis.
`kinesis_source_row_count`	Counter	Stream peer	Count of rows read from Kinesis.
`kinesis_source_value_count`	Counter	Stream peer	Count of values read from Kinesis.
`hdx_sink_backlog_bytes_count`	Gauge	Intake head	Total bytes of all partition buckets in sink backlog waiting to be indexed. Only produced when `intake_head_index_backlog_enabled` is `true`.
`hdx_sink_backlog_items_count`	Gauge	Intake head	Total count of partition buckets in sink backlog waiting to be indexed. Only produced when `intake_head_index_backlog_enabled` is `true`.
`kinesis_source_lag_ms`	Gauge	Stream peer	Measure of lag in Kinesis source.
`hdx_sink_backlog_trim_duration_ns`	Histogram	Intake head	Time to trim the backlog in nanoseconds. Only produced when `intake_head_index_backlog_enabled` is `true`.
`http_source_request_duration_ns`	Histogram	Stream head	A histogram of HTTP request durations in nanoseconds.
`kinesis_source_checkpoint_duration_ns`	Histogram	Stream peer	Duration of Kinesis checkpoint operations.
`kinesis_source_operation_duration_ns`	Histogram	Stream peer	Histogram of duration of operations on Kinesis.