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callcount

log.Fatalf

standard library

The 217th most-called standard-library function by production calls. Called 11,254 times across 462 modules; 4,631 of those run outside tests and generated code.

1% in production calls vs 2026-W37 (4,582 → 4,631)

All of log → Docs on pkg.go.dev ↗

prod calls
4,631
non-test, non-generated
all calls
11,254
total callsites
modules
462
distinct callers
in loop
14%
of prod calls
in tests
59%
6,615 calls
resolved
100%
to a known target

resolution mix

How each call resolves

How each call was attributed. Only resolved kinds, where the target function is known, count toward the ranking. Interface dispatch and unresolved receivers are reported separately and never guessed. Read the taxonomy →

  • Package function100%A direct call to an exported package function, resolved by type.

who calls this

Notable callers

Production calls into Fatalf from notable Go projects. Open one on the map to see what else it hammers.

where it's called

Callsites in the wild

12 representative callsites of 11,254, prioritizing in-loop and non-test usage. We link to source, never display it.

Fatalf · 12 of 11,254 callsites

top callers

The modules that reach for it

The modules that call Fatalf most in this snapshot.

  • github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/network/armnetwork/v72,87326%
  • github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/compute/armcompute/v72,30520%
  • github.com/tailscale/tailscale2732%
  • tailscale.com2732%
  • github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/dns/armdns1661%

siblings

More from log

The other most-called functions in this package. See all →