feat: some grpc collectors

[fmorency]

This pull request introduces a new project, manifest-node-exporter, which serves as a Prometheus metrics exporter for the Manifest Network node. It includes the addition of core functionality, command-line interface (CLI) commands, gRPC client integration, and licensing. Below is a summary of the most important changes grouped by theme.

Project Setup and Licensing:

• Added an Apache License 2.0 to the project, defining terms for use, reproduction, and distribution of the code. (LICENSE, LICENSER1-R201)
• Initialized the Go module with dependencies for Prometheus, gRPC, and CLI libraries in go.mod. (go.mod, go.modR1-R44)

CLI Commands:

• Implemented the root command in cmd/root.go, which initializes the CLI, sets up logging, and binds configuration flags using viper. (cmd/root.go, cmd/root.goR1-R84)
• Added the serve command in cmd/serve.go, which starts a Prometheus metrics server, integrates gRPC-based collectors, and supports graceful shutdown on signals. (cmd/serve.go, cmd/serve.goR1-R142)

gRPC Client and Collectors:

• Created a GRPCClient in pkg/client/grpc_client.go for establishing and managing gRPC connections with support for TLS and keepalive parameters. (pkg/client/grpc_client.go, pkg/client/grpc_client.goR1-R52)
• Added utility functions in pkg/collectors/grpc/common.go for validating gRPC clients and reporting Prometheus metrics. (pkg/collectors/grpc/common.go, pkg/collectors/grpc/common.goR1-R43)

Entry Point:

• Added the main entry point in main.go to execute the CLI commands. (main.go, main.goR1-R7)

[Copilot]

Pull Request Overview

This PR introduces the manifest-node-exporter project, a Prometheus metrics exporter for the Manifest Network node, integrating a gRPC client and various metric collectors. Key changes include:

• Project setup with Apache 2.0 licensing and Go module initialization
• Addition of CLI commands (root and serve) for exporter startup with graceful shutdown
• Implementation of gRPC-based collectors (token count, denom information) and a gRPC client for metric queries

Reviewed Changes

Copilot reviewed 13 out of 14 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
pkg/config/serve.go	Adds validation and loading of serve configuration options
pkg/collectors/grpc/token_count.go	Implements a gRPC collector for token count metrics
pkg/collectors/grpc/registry.go	Provides a registry for gRPC collectors with factory registration
pkg/collectors/grpc/denom_info_umfx.go	Registers a collector for the fixed denom "umfx"
pkg/collectors/grpc/denom_info.go	Implements a collector for denomination metadata and supply metrics
pkg/collectors/grpc/common.go	Defines helper functions for metric reporting and gRPC client validation
pkg/client/grpc_client.go	Creates the gRPC client with TLS and keepalive configuration
cmd/serve.go	Implements the CLI “serve” command, initializing collectors, HTTP server, and handling shutdown
cmd/root.go	Implements the root CLI command with logging configuration via Viper
LICENSE	Adds the Apache License 2.0 document

Files not reviewed (1)

• go.mod: Language not supported