Add amd64-specific build tag for eBPF integration (grafana#1652)

docs/developer/contributing.md

@@ -86,7 +86,7 @@ The Makefile provides several targets:
 Compiling the Agent on Linux requires a couple of extra dependencies.
 These are 
 * [systemd headers](https://github.com/grafana/agent/blob/main/cmd/agent/Dockerfile#L8-L9) for Promtail
-* [bcc tools](https://github.com/grafana/agent/blob/main/cmd/agent/Dockerfile#L12-L13) for the eBPF integration
+* [bcc tools](https://github.com/grafana/agent/blob/main/cmd/agent/Dockerfile#L12-L13) for the eBPF integration on AMD64 systems
 
 If you have issues installing the bcc tooling, you can use `-tags=noebpf` to compile the Agent without the eBPF integration.
 

docs/user/configuration/integrations/integrations-next/ebpf-config.md

@@ -10,10 +10,10 @@ It is an embedded version of
 that allows the Agent to attach eBPF programs to the host kernel
 and export defined metrics in a Prometheus-compatible format.
 
-As such, this integration comes with the relevant caveats of
-running eBPF programs on your host, like being on a kernel 
-version >4.1, specific kernel flags being enabled, plus 
-superuser access is most usually required.
+As such, this integration is only supported on Linux/AMD64, and
+it comes with the relevant caveats of running eBPF programs 
+on your host, like being on a kernel version >4.1, specific
+kernel flags being enabled, plus having superuser access.
 
 Currently, the exporter only supports `kprobes`, that is
 kernel-space probes.

pkg/integrations/v2/ebpf/integration.go

@@ -1,5 +1,5 @@
-//go:build linux && !noebpf
-// +build linux,!noebpf
+//go:build linux && amd64 && !noebpf
+// +build linux,amd64,!noebpf
 
 package ebpf
 

pkg/integrations/v2/ebpf/integration_stub.go

@@ -1,5 +1,5 @@
-//go:build !linux || noebpf
-// +build !linux noebpf
+//go:build !linux || !amd64 || noebpf
+// +build !linux !amd64 noebpf
 
 package ebpf