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Monitor the Grafana Alloy component controller
The Alloy component controller exposes Prometheus metrics which you can use to investigate the controller state.
Metrics for the controller are exposed at the /metrics
HTTP endpoint of the Alloy HTTP server, which defaults to listening on http://localhost:12345
.
The documentation for the
alloy run
command describes how to modify the address Alloy listens on for HTTP traffic.
The controller exposes the following metrics:
alloy_component_controller_evaluating
(Gauge): Set to1
whenever the component controller is currently evaluating components. This value may be misrepresented depending on how fast evaluations complete or how often evaluations occur.alloy_component_controller_running_components
(Gauge): The current number of running components by health. The health is represented in thehealth_type
label.alloy_component_evaluation_seconds
(Histogram): The time it takes to evaluate components after one of their dependencies is updated.alloy_component_dependencies_wait_seconds
(Histogram): Time spent by components waiting to be evaluated after one of their dependencies is updated.alloy_component_evaluation_queue_size
(Gauge): The current number of component evaluations waiting to be performed.
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