📚 Update doc

Makefile

@@ -2,26 +2,25 @@
 
 PKGS=$(shell go list ./... | grep -v "/vendor/")
 
-.PHONY: test
-
 APP_NAME = faultdetector
-GREEN = \033[0;32m
-BLUE = \033[0;34m
+GREEN = \033[1;32m
+BLUE = \033[1;34m
 COLOR_END = \033[0;39m
 
-build:
+build: # Builds the application and create a binary at ./bin/
 	@echo "$(BLUE)» Building fault detector application binary... $(COLOR_END)"
-	@CGO_ENABLED=0 go build -a -v -o bin/$(APP_NAME) ./cmd/
+	@CGO_ENABLED=0 go build -a -o bin/$(APP_NAME) ./cmd/
 	@echo "$(GREEN) Binary successfully built$(COLOR_END)"
 
-run-app:
+run-app: # Runs the application, use `make run-app config={PATH_TO_CONFIG_FILE}` to provide custom config
 ifdef config
 	@./bin/${APP_NAME} --config $(config)
 else
 	@./bin/${APP_NAME}
 endif
 
-test:
+.PHONY: test
+test: # Runs tests
 	@echo "Test packages"
 	@go test -race -shuffle=on -coverprofile=coverage.out -cover $(PKGS)
 
@@ -31,29 +30,33 @@ test.coverage: test
 test.coverage.html: test
 	go tool cover -html=coverage.out
 
-lint:
+lint: # Runs golangci-lint on the repo
 	@go install github.com/golangci/golangci-lint/cmd/golangci-lint@latest
 	golangci-lint run
 
-format:
+format: # Runs gofmt on the repo
 	gofmt -s -w .
 
-godocs:
+godocs: # Runs godoc and serves via endpoint
 	@go install golang.org/x/tools/cmd/godoc@latest
 	@echo "open http://localhost:6060/pkg/github.com/LiskHQ/op-fault-detector"
 	 godoc -http=:6060
 
 .PHONY: docker-build
-docker-build:
+docker-build: # Builds docker image
 	@echo "$(BLUE) Building docker image...$(COLOR_END)"
 	@docker build -t $(APP_NAME) .
 
 .PHONY: docker-run
-docker-run:
+docker-run: # Runs docker image, use `make docker-run config={PATH_TO_CONFIG_FILE}` to provide custom config
 ifdef config
 	@echo "$(BLUE) Running docker image...$(COLOR_END)"
 	@docker run -p 8080:8080 -v $(config):/home/onchain/faultdetector/config.yaml -t $(APP_NAME)
 else
 	@echo "$(BLUE) Running docker image...$(COLOR_END)"
 	@docker run -p 8080:8080 $(APP_NAME)
 endif
+
+.PHONY: help
+help: # Show help for each of the Makefile recipes.
+	@grep -E '^[a-zA-Z0-9 -]+:.*#'  Makefile | sort | while read -r l; do printf "$(GREEN)$$(echo $$l | cut -f 1 -d':')$(COLOR_END):$$(echo $$l | cut -f 2- -d'#')\n"; done

README.md

@@ -1,3 +1,109 @@
 # op-fault-detector
 
-Fault detector is a service to detect mismatch between a local view of the Optimism network and L2 output proposals published to Ethereum.
+Fault detector is a service to detect mismatch between a local view of the Optimism or superchain network and L2 output proposals published to Ethereum. The is an alternate implementation of the [fault monitoring](https://github.com/ethereum-optimism/optimism/blob/v1.5.0/packages/chain-mon/src/fault-mon/README.md) service from [Optimism](https://www.optimism.io/).
+
+## How it works
+
+The state root of the block is published to the [L2OutputOracle](https://github.com/ethereum-optimism/optimism/blob/39b7262cc3ffd78cd314341b8512b2683c1d9af7/packages/contracts-bedrock/contracts/L1/L2OutputOracle.sol) contract on Ethereum. The `L2OutputOracle` is inferred from the portal contract.
+
+In the application we take state root of the given block as reported by an Optimism node and compute `outputRoot` from it and compare it with the `outputRoot` as published to `L2OutputOracle` contract on  Ethereum. 
+
+## Installation
+
+```
+git clone https://github.com/liskhq/op-fault-detector
+make build
+```
+
+## Running Fault Detector
+
+Copy `config.yaml` file and use any name with `.yaml` extension or edit existing `config.yaml` file to set configuration for the application.
+
+```
+make run-app
+```
+if want to provide custom file, for example, `my-config.yaml`, run,
+
+```
+make run-app config=/path/to/my-config.yaml
+```
+
+View all available commands by running `make help` and view the commands with options as below.
+
+```sh
+build: Builds the application and create a binary at ./bin/
+
+docker-build: Builds docker image
+
+docker-run: Runs docker image, use `make docker-run config={PATH_TO_CONFIG_FILE}` to provide custom config
+
+format: Runs gofmt on the repo
+
+godocs: Runs godoc and serves via endpoint
+
+help: Show help for each of the Makefile recipes.
+
+lint: Runs golangci-lint on the repo
+
+run-app: Runs the application, use `make run-app config={PATH_TO_CONFIG_FILE}` to provide custom config
+
+test: Runs tests
+```
+
+## Config
+
+Config file is used to configure the application. Currently below is the default config found under `./config.yaml`. To provide custom config, edit the `./config.yaml` or create own and provide it while running the application `make run-app config={PATH_TO_CUSTOM_CONFIG_FILE}`
+
+```yaml
+# General system configurations
+system:
+  log_level: "info"
+
+# API related configurations
+api:
+  server:
+    host: "127.0.0.1"
+    port: 8080
+  base_path: "/api"
+  register_versions:
+    - v1
+
+# Faultdetector configurations
+fault_detector:
+  l1_rpc_endpoint: "https://rpc.notadegen.com/eth"
+  l2_rpc_endpoint: "https://mainnet.optimism.io/"
+  start_batch_index: -1
+  l2_output_oracle_contract_address: "0x0000000000000000000000000000000000000000"
+
+```
+### System Config
+- `system.log_level`: Set log level of the application, by default `info` and available options are `warn`, `debug`, `error` and `fatal`
+
+### API Config
+- `api.server.host`: Host of application
+- `api.server.port`: Port of application
+- `api.base_path`: Base path for the API
+- `register_versions`: Versions for APIs
+
+### Fault Detector Config
+
+- `fault_detector.l1_rpc_endpoint`: RPC endpoint for L1 chain.
+- `fault_detector.l2_rpc_endpoint`: RPC endpoint for L2 chain.
+- `fault_detector.start_batch_index`: Provide batch_index to start from. If not provided, it will pick default `-1` and then application will find the first unfinalized batch index that has not yet passed the fault proof window.
+- `fault_detector.l2_output_oracle_contract_address`: Deployed `OptimismPortal` contract address used to retrieve necessary info for output verification. Only provided for the chains other than Optimism and Lisk Superchain.
+
+## API and Metrics
+
+### API
+- Status API exposed via `{api.server.host}:{api.server.port}/api/v1/status`
+- Metrics is exposed at `{api.server.host}:{api.server.port}/metrics`
+- `{api.server.host}` in `config.yaml` defaults to `127.0.0.1`
+- `{api.server.port}` in `config.yaml` defaults to `8080`
+
+### Metrics
+
+```sh
+- fault_detector_highest_output_index      prometheus.Gauge     Highest known output index.
+- fault_detector_is_state_mismatch         prometheus.Gauge     0 if state is ok, 1 if state is mismatched.
+- fault_detector_api_connection_failure    prometheus.Gauge     Number of API RPC calls failed for L1 and L2 nodes
+```