29-haskell-foldmap-summary
This example shows intermediate Haskell aggregation with foldMap and monoids.
It includes:
- a structured deployment event type,
- a summary type built from monoidal fields,
- one
foldMappass that aggregates several useful metrics, and - a test suite run by
nix flake check.
Useful commands:
nix develop
cabal run
cabal run -- api:production:succeeded:3:platform,security worker:staging:failed-db-lock:1:ops ui:production:cancelled:2:frontend
cabal test
nix build
./result/bin/mini-summary api:production:succeeded:3:platform,security worker:staging:failed-db-lock:1:ops ui:production:cancelled:2:frontend
nix run . -- api:production:succeeded:3:platform,security worker:staging:failed-db-lock:1:ops ui:production:cancelled:2:frontend
nix flake check