Invocations / day4.2%
24.9M
80 functions
Error rate0.08pp
0.2%
80 of 320 sample
p99 duration22ms
380ms
cold + warm
Cold start %0.4pp
10.6%
34 cold in sample
Functions healthy1pp
70%
56 of 80
Cold $ / day12
$1.7K
45 budgets watch
Invocations vs errors
Northline Functions · daily
InvocationsErrors × 50
Mon Provisioned concurrency · settleWed Memory right-size · catalogThu eu-west-1 capacity bumpSat Cold spike · billing path
Invocation sample by class
320 rows
138
2xx
102
4xx
80
5xx
34
Cold
Highest cold cost
Cold-start board
| Function | Cold% | $ |
|---|---|---|
| fn-slot-book | 11.5 | $173.92 |
| fn-ledger-post | 10.7 | $83.07 |
| fn-loyalty-burn | 6.4 | $82.01 |
| fn-driver-assign | 14.2 | $81.69 |
| fn-ocr-scan | 12.4 | $71.45 |
| fn-eta-predict | 8.6 | $66.99 |
| fn-feature-flag | 14.1 | $66.00 |
Top functions by traffic
inv/day
| Function | Runtime | Inv/day | Cold% | p99 |
|---|---|---|---|---|
| fn-slot-book | go1.22 | 1.23M | 11.5 | 821 |
| fn-orders-create | node20 | 1.22M | 3.2 | 360 |
| fn-cert-renew | node20 | 1.12M | 4.2 | 455 |
| fn-loyalty-burn | node18 | 1.06M | 6.4 | 246 |
| fn-pos-void | node20 | 1.06M | 4.7 | 297 |
| fn-inventory-read | go1.22 | 860K | 1.1 | 95 |
| fn-webhook-retry | go1.22 | 808K | 5.7 | 1047 |
| fn-geo-lookup | node20 | 681K | 3.9 | 449 |
SLO health
availability target 99.9%
100%
est. avail
Error rate0.2%
Functions healthy70%
High cold cost28
Budgets ≥50% burn45
Root-caused alerts
symptom → cause → fix
Do this next
scored from cold cost · error budget
#194
Provision settle concurrency
Cut ~$28/day cold · protect SLO
$28.00 at stake / day
#288
Right-size EDI memory
Stop OOM · burn recovery
$12.00 at stake / day
#381
Reserved concurrency payments
Kill 429 storm under peak
$18.00 at stake / day
#472
Keep-warm report-export
eu-west-1 cold tax
$9.00 at stake / day