See exactly what happened before the crash — SQL queries, controller actions, cache operations, job executions, and mailer deliveries captured automatically via ActiveSupport::Notifications.

• Automatic capture — zero config beyond the enable flag
• N+1 query detection with aggregate patterns page
• Deprecation warnings with aggregate view
• Custom breadcrumbs via RailsErrorDashboard.add_breadcrumb("checkout started", { cart_id: 123 })
• Safe by design — fixed-size ring buffer, thread-local, every subscriber wrapped in rescue

config.enable_breadcrumbs = true

Complete documentation →

Know your app's runtime state at the moment of failure — GC stats, process memory, thread count, connection pool utilization, Puma thread stats, RubyVM cache health, and YJIT compilation stats captured automatically.

• Sub-millisecond total snapshot, every metric individually rescue-wrapped
• No ObjectSpace scanning, no Thread backtraces, no subprocess calls
• RubyVM.stat: constant cache invalidations, shape cache stats
• YJIT runtime stats: compiled iseqs, invalidation count, code region sizes

config.enable_system_health = true

Complete documentation →

Cross-error N+1 detection grouped by SQL fingerprint, and aggregate deprecation warnings with occurrence counts.

Requires breadcrumbs to be enabled.

Complete documentation →

Job Health — Auto-detects Sidekiq, SolidQueue, or GoodJob. Per-error table with adapter badge, failed count (color-coded), sorted worst-first.

Database Health — PgHero-style live PostgreSQL stats (table sizes, unused indexes, dead tuples, vacuum timestamps) plus historical connection pool data from error snapshots.

Cache Health — Per-error cache performance sorted worst-first.

Complete documentation →

View actual source code directly in error backtraces with +/-7 lines of context. Git blame shows who last modified the code, when, and the commit message. Repository links jump to GitHub/GitLab/Bitbucket at the exact line.

config.enable_source_code_integration = true
config.enable_git_blame = true

Complete documentation →

Replay failing requests with one click. Copy the request as a cURL command or generate an RSpec test from the captured error context.

Complete documentation →

Multi-channel alerting with severity filters, per-error cooldown, and milestone threshold alerts to prevent alert fatigue.

config.enable_slack_notifications = true
config.slack_webhook_url = ENV['SLACK_WEBHOOK_URL']

Notification setup guide →

Seven analysis engines built in:

1. Baseline Anomaly Alerts — Statistical spike detection (mean + std dev) with intelligent cooldown
2. Fuzzy Error Matching — Jaccard similarity + Levenshtein distance to find related errors
3. Co-occurring Errors — Detect errors that happen together within configurable time windows
4. Error Cascade Detection — Identify chains (A causes B causes C) with probability and delays
5. Error Correlation Analysis — Correlate errors with app versions, git commits, and users
6. Platform Comparison — iOS vs Android vs Web health metrics side-by-side
7. Occurrence Pattern Detection — Cyclical patterns (business hours, weekends) and burst detection

Complete documentation →

See the exact values of local variables and instance variables at the moment an exception was raised — the most valuable debugging context possible.

• TracePoint(:raise) captures locals and ivars before the stack unwinds
• Configurable limits: max variable count, nesting depth, string truncation length
• Sensitive data auto-filtered via Rails filter_parameters — passwords, tokens, and PII never stored
• Never stores Binding objects — values extracted immediately, Binding is GC'd
• Independent config flags: enable one or both

config.enable_local_variables = true
config.enable_instance_variables = true

Complete documentation →

Detect exceptions that are raised but silently rescued — the hardest bugs to find. No other error tracker does this.

• Uses TracePoint(:raise) + TracePoint(:rescue) to track exception lifecycle
• Identifies code paths where exceptions are caught but never logged or re-raised
• Dashboard page at /errors/swallowed_exceptions shows detection counts, locations, and patterns
• Memory-bounded aggregation with background flush
• Requires Ruby 3.3+

config.detect_swallowed_exceptions = true

Complete documentation →

Snapshot your app's entire system state on demand — environment, GC stats, threads, connection pool, memory, job queue health, and more.

• Trigger via dashboard button or rake rails_error_dashboard:diagnostic_dump
• Dashboard page at /errors/diagnostic_dumps with full history
• Useful for debugging intermittent production issues without reproducing them

config.enable_diagnostic_dump = true

Complete documentation →

Track Rack Attack security events (throttles, blocklists, tracks) as breadcrumbs attached to errors, with a dedicated summary page.

• Captures throttle, blocklist, and track events automatically
• Dashboard page at /errors/rack_attack_summary with event breakdown
• Requires breadcrumbs to be enabled

config.enable_rack_attack_tracking = true

Complete documentation →

Capture unhandled exceptions that crash the Ruby process via an at_exit hook — the last line of defense.

• Disk-based fallback: writes crash data to disk because the database may be unavailable during shutdown
• Imported automatically on next boot
• Captures exception details, backtrace, uptime, GC stats, thread count, and cause chain
• A self-hosted only feature — impossible for SaaS tools

config.enable_crash_capture = true

Complete documentation →

Event-driven extensibility with hooks for on_error_logged, on_error_resolved, on_threshold_exceeded. Built-in examples for Jira integration, metrics tracking, and audit logging.

class MyPlugin < RailsErrorDashboard::Plugin
  def on_error_logged(error_log)
    # Your custom logic
  end
end

Plugin System guide →