klag-exporter 0.1.9

High-performance Kafka consumer group lag exporter with offset and time lag metrics
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# Build stage
FROM rust:1.83-bookworm AS builder

# Install build dependencies for rdkafka
RUN apt-get update && apt-get install -y \
    cmake \
    build-essential \
    libssl-dev \
    libsasl2-dev \
    pkg-config \
    && rm -rf /var/lib/apt/lists/*

WORKDIR /app

# Copy manifests
COPY Cargo.toml Cargo.lock ./

# Create dummy source to cache dependencies
RUN mkdir src && \
    echo "fn main() {}" > src/main.rs && \
    cargo build --release && \
    rm -rf src

# Copy actual source
COPY src ./src

# Build the release binary
RUN touch src/main.rs && cargo build --release

# Runtime stage
FROM debian:bookworm-slim

# Install runtime dependencies
RUN apt-get update && apt-get install -y \
    ca-certificates \
    libssl3 \
    libsasl2-2 \
    curl \
    wget \
    && rm -rf /var/lib/apt/lists/*

# Create non-root user
RUN useradd -r -g root klag

WORKDIR /app

# Copy binary from builder
COPY --from=builder /app/target/release/klag-exporter /app/klag-exporter

# Copy example config
COPY config.example.toml /app/config.example.toml

# Set ownership
RUN chown -R klag:root /app

USER klag

# Expose Prometheus metrics port
EXPOSE 8000

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
    CMD curl -f http://localhost:8000/health || exit 1

ENTRYPOINT ["/app/klag-exporter"]
CMD ["--config", "/app/config.toml"]