feature: railway resources

railway-resources/telegraf/Dockerfile

···
+# Telegraf Dockerfile for Railway Deployment
+FROM telegraf:1.33-alpine
+
+# Install additional packages for health checks
+RUN apk add --no-cache curl postgresql-client
+
+# Create directories for custom configs
+RUN mkdir -p /etc/telegraf/telegraf.d
+
+# Copy main configuration
+COPY railway-resources/telegraf/telegraf.conf /etc/telegraf/telegraf.conf
+
+# Health check - test configuration validity
+HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
+    CMD telegraf --config /etc/telegraf/telegraf.conf --test || exit 1
+
+# Run telegraf with custom config
+CMD ["telegraf", "--config", "/etc/telegraf/telegraf.conf", "--config-directory", "/etc/telegraf/telegraf.d"]

railway-resources/telegraf/railway.toml

···
+# Railway configuration for Telegraf service
+# This file configures how Railway builds and deploys the Telegraf metrics collector
+
+[build]
+# Use Dockerfile for building
+builder = "DOCKERFILE"
+dockerfilePath = "railway-resources/telegraf/Dockerfile"
+
+[deploy]
+# Start command (handled by Dockerfile CMD)
+startCommand = "telegraf --config /etc/telegraf/telegraf.conf"
+
+# No health check path for Telegraf (uses container health check)
+# healthcheckPath = ""
+
+# Restart policy
+restartPolicyType = "ALWAYS"
+restartPolicyMaxRetries = 10
+
+# Resource limits
+memoryLimitMB = 1024
+cpuLimitCores = 1
+
+# Scaling (Telegraf should be singleton)
+minReplicas = 1
+maxReplicas = 1
+
+# Graceful shutdown
+stopTimeout = 10
+
+# Service configuration for StatsD UDP endpoint
+[[services]]
+name = "telegraf-statsd"
+port = 8125
+protocol = "UDP"
+internalPort = 8125
+
+# Service configuration for Telegraf HTTP API (optional)
+[[services]]
+name = "telegraf-http"
+port = 8086
+protocol = "HTTP"
+internalPort = 8086
+
+# Environment-specific settings
+[environments.production]
+memoryLimitMB = 512
+cpuLimitCores = 1

railway-resources/telegraf/telegraf.conf

···
+# Telegraf Configuration for QuickDID Metrics Collection
+# Optimized for Railway deployment with TimescaleDB
+
+# Global tags applied to all metrics
+[global_tags]
+  environment = "${ENVIRONMENT:-production}"
+  service = "quickdid"
+  region = "${RAILWAY_REGION:-us-west1}"
+  deployment_id = "${RAILWAY_DEPLOYMENT_ID:-unknown}"
+
+# Agent configuration
+[agent]
+  ## Default data collection interval
+  interval = "10s"
+  
+  ## Rounds collection interval to interval
+  round_interval = true
+  
+  ## Telegraf will send metrics to outputs in batches of at most metric_batch_size metrics.
+  metric_batch_size = 1000
+  
+  ## Maximum number of unwritten metrics per output
+  metric_buffer_limit = 10000
+  
+  ## Collection jitter is used to jitter the collection by a random amount
+  collection_jitter = "0s"
+  
+  ## Default flushing interval for all outputs
+  flush_interval = "10s"
+  
+  ## Jitter the flush interval by a random amount
+  flush_jitter = "0s"
+  
+  ## Precision of timestamps
+  precision = "1ms"
+  
+  ## Log level
+  debug = ${TELEGRAF_DEBUG:-false}
+  quiet = ${TELEGRAF_QUIET:-false}
+  
+  ## Override default hostname
+  hostname = "${HOSTNAME:-telegraf}"
+  
+  ## If true, do not set the "host" tag in the telegraf agent
+  omit_hostname = false
+
+###############################################################################
+#                            INPUT PLUGINS                                   #
+###############################################################################
+
+# StatsD Server - receives metrics from QuickDID
+[[inputs.statsd]]
+  service_address = ":8125"  # Listen on UDP port 8125 for StatsD metrics
+  protocol = "udp"
+  delete_gauges = true
+  delete_counters = true
+  delete_sets = true
+  delete_timings = true
+  percentiles = [50, 90, 95, 99]
+  metric_separator = "."
+  allowed_pending_messages = 100
+  datadog_extensions = true
+  datadog_distributions = true
+
+[[outputs.postgresql]]
+  connection = "${DATABASE_URL}"
+  
+  schema = "public"
+  
+  create_templates = [
+    '''CREATE TABLE IF NOT EXISTS {{.table}} ({{.columns}})''',
+    '''SELECT create_hypertable({{.table|quoteLiteral}}, 'time', if_not_exists => TRUE)''',
+  ]
+  
+  tags_as_jsonb = true
+  
+  fields_as_jsonb = false

src/metrics.rs

···
     ) -> Result<Self, Box<dyn std::error::Error>> {
         tracing::info!("Creating StatsdMetricsPublisher: host={}, prefix={}, tags={:?}", host, prefix, default_tags);
         
-        let socket = UdpSocket::bind("0.0.0.0:0")?;
+        // let socket = UdpSocket::bind("0.0.0.0:0")?;
+        let socket = UdpSocket::bind("[::0]:0")?;
         socket.set_nonblocking(true)?;
         
         let buffered_sink = BufferedUdpMetricSink::from(host, socket)?;