Description of problem:

Thanos restarts with below error:

observability-thanos-compact-0 1/1 Running 1811 (4m45s ago) 21d

ts=2026-02-05T00:20:20.306280544Z caller=compact.go:522 level=info msg="downsampling iterations done"
runtime/cgo: pthread_create failed: Resource temporarily unavailable
SIGABRT: abort
PC=0x7fd913f6bedc m=2 sigcode=18446744073709551610

goroutine 0 gp=0xc000006a80 m=2 mp=0xc000118708 [idle]:
runtime: g 0 gp=0xc000006a80: unknown pc 0x7fd913f6bedc
stack: frame={sp:0x7fd8cd2ea760, fp:0x0} stack=[0x7fd8ccaeb1e0,0x7fd8cd2eade0)
0x00007fd8cd2ea660: 0x0000000000000000 0x0000000000000000
0x00007fd8cd2ea670: 0x0000000000000000 0x0000000000000000
0x00007fd8cd2ea680: 0x0000000000000000 0x0000000000000000
0x00007fd8cd2ea690: 0x0000000000000000 0x0000000000000000
0x00007fd8cd2ea6a0: 0x0000000000000000 0x0000000000000000
0x00007fd8cd2ea6b0: 0x0000000000000000 0x0000000000000000
0x00007fd8cd2ea6c0: 0x0000000000000000 0x0000000000000000
0x00007fd8cd2ea6d0: 0x0000000000000000 0x0000000000000000
0x00007fd8cd2ea6e0: 0x0000000000000000 0x0000000000000000
0x00007fd8cd2ea6f0: 0x0000000000000000 0x0000000000000000

Version-Release number of selected component (if applicable):

advanced-cluster-management.v2.14.1

How reproducible:

At customers end

Additional info: will add as `RH only comment`