Configuration reference
Grafana Alloy supports eBPF profiling. The configuration file is written in the River language and is composed of components that are used to collect, transform, and send data.
The pyroscope.ebpf
component is used to collect application performance profiles via eBPF.
The pyroscope.ebpf
runs on the host machine and collects stack traces associated with a process running on the current host.
Using the targets
argument, you can specify which processes and containers to profile on the machine. The targets
can be from discovery components such as discovery.process
, discovery.kubernetes
, discovery.docker
, and discovery.dockerswarm
.
You can use the discovery.relabel
component to relabel discovered targets and set your own labels.
For more information, refer to the Components documentation.
The forward_to
parameter should point to a pyroscope.write
component to send the collected profiles to your Pyroscope Server or Grafana Cloud.
Name | Type | Description | Default | Required |
---|---|---|---|---|
targets | list(map(string)) | List of targets to group profiles by container id | yes | |
forward_to | list(ProfilesReceiver) | List of receivers to send collected profiles to. | yes | |
collect_interval | duration | How frequently to collect profiles | 15s | no |
sample_rate | int | How many times per second to collect profile samples | 97 | no |
pid_cache_size | int | The size of the pid -> proc symbols table LRU cache | 32 | no |
build_id_cache_size | int | The size of the elf file build id -> symbols table LRU cache | 64 | no |
same_file_cache_size | int | The size of the elf file -> symbols table LRU cache | 8 | no |
container_id_cache_size | int | The size of the pid -> container ID table LRU cache | 1024 | no |
collect_user_profile | bool | A flag to enable/disable collection of userspace profiles | true | no |
collect_kernel_profile | bool | A flag to enable/disable collection of kernelspace profiles | true | no |
demangle | string | C++ demangle mode. Available options are: none , simplified , templates , full | none | no |
Supported languages
The pyroscope.ebpf
component supports the following languages:
- Go
- Rust
- C/C++ with frame pointers enabled
- Python
Send data Grafana Cloud Profiles
When sending to Grafana Cloud Profiles, you can use the following pyroscope.write
component configuration which makes uses of environment variables:
pyroscope.write "endpoint" {
endpoint {
basic_auth {
password = env("GC_PASSWORD")
username = env("GC_USER")
}
url = env("GC_URL")
}
}
Ensure that you have appropriately configured the GC_URL
, GC_USER
, and GC_PASSWORD
environment variables.
Profile collecting behavior
The pyroscope.ebpf
component collects stack traces associated with a process running on the current host.
You can use the sample_rate
argument to define the number of stack traces collected per second. The default is 97.
The following labels are automatically injected into the collected profiles if you have not defined them. These labels can help you pin down a profiling target.
Label | Description |
---|---|
service_name | Pyroscope service name. It’s automatically selected from discovery meta labels, if possible. Otherwise, it defaults to unspecified . |
__name__ | pyroscope metric name. Defaults to process_cpu . |
__container_id__ | The container ID derived from target. |
Privileges
You are required to run the agent as root and inside host pid namespace in order to pyroscope.ebpf
component to work.
Targets
One of the following special labels must be included in each target of targets
and the label must correspond to the container or process that is profiled:
__container_id__
: The container ID.__meta_docker_container_id
: The ID of the Docker container.__meta_kubernetes_pod_container_id
: The ID of the Kubernetes pod container.__process_pid__
: The process ID.
Each process is then associated with a specified target from the targets list, determined by a container ID or process PID.
If a process’s container ID matches a target’s container ID label, the stack traces are aggregated per target based on the container ID. If a process’s PID matches a target’s process PID label, the stack traces are aggregated per target based on the process PID. Otherwise, the process is not profiled.
Service name
The special label service_name
is required and must always be present. If it’s not specified, it is
attempted to be inferred from multiple sources:
__meta_kubernetes_pod_annotation_pyroscope_io_service_name
which is apyroscope.io/service_name
pod annotation.__meta_kubernetes_namespace
and__meta_kubernetes_pod_container_name
__meta_docker_container_name
__meta_dockerswarm_container_label_service_name
and__meta_dockerswarm_service_name
If service_name
is not specified and could not be inferred, it is set to unspecified
.
Exposed Prometheus metrics
The pyroscope.ebpf
component exposes the following Prometheus metrics:
pyroscope_fanout_latency
(histogram): Write latency for sending to direct and indirect components.pyroscope_ebpf_active_targets
(gauge): Number of active targets the component tracks.pyroscope_ebpf_profiling_sessions_total
(counter): Number of profiling sessions completed.pyroscope_ebpf_profiling_sessions_failing_total
(counter): Number of profiling sessions failed.pyroscope_ebpf_pprofs_total
(counter): Number of pprof profiles collected by the ebpf component.
More information
Check out the following resources to learn more about eBPF profiling:
- The pros and cons of eBPF profiling blog post (for more context on flame graphs below)
- Demo showing breakdown of our examples cluster
- Grafana Alloy
- pyroscope.scrape
- pyroscope.write
- discovery.kubernetes
- discovery.docker
- discovery.relabel