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mev-beta/docs/LOG_ANALYSIS_COMPREHENSIVE_REPORT_20251030.md

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Comprehensive Log Analysis Report

Date: 2025-10-30 Analysis Period: Full historical logs + recent 7-day activity Total Log Volume: 927 MB (current) + 826 MB (archived)

Executive Summary

Critical issues identified across 1.75 GB of log data spanning multiple MEV bot runs. The system is experiencing severe operational failures that prevent profitable arbitrage execution:

  • 100,709 rate limit errors - System exceeding RPC provider limits
  • 9,065 WebSocket protocol errors - Connection initialization failures
  • 184,708 total errors in current error log (42 MB)
  • 100% of liquidity events contain invalid zero addresses
  • 0 successful arbitrage executions - All opportunities rejected
  • 147,078 errors in most recent archived run

🚨 CRITICAL ISSUES (P0 - Immediate Action Required)

1. WebSocket Protocol Scheme Error

Severity: CRITICAL | Impact: Complete connection failure Occurrences: 9,065 instances

ERROR] ❌ Failed to get latest block: Post "wss://arbitrum-mainnet.core.chainstack.com/...":
unsupported protocol scheme "wss"

Root Cause: Code attempting to make HTTP POST requests to WebSocket URLs

  • Location: Likely in pkg/monitor/concurrent.go or pkg/arbitrum/connection.go
  • Impact: Bot cannot connect to Arbitrum network via WebSocket
  • Fix Required: Use ethclient.Dial() for WebSocket connections, not HTTP client

2. Rate Limiting Catastrophe

Severity: CRITICAL | Impact: Service degradation and failures Total Occurrences: 100,709 (67,841 current + 32,868 archived)

Error Pattern:

ERROR] Failed to get latest block header: 429 Too Many Requests:
{"jsonrpc":"2.0","error":{"code":429,"message":"Too Many Requests"}}

Affected Operations:

  • Block header fetching: 522 errors on primary endpoint
  • Pool data queries: 86-79 errors per pool (multiple pools affected)
  • Contract calls (slot0, liquidity, token0/1, fee): 15-86 errors per call type
  • Transaction nonce retrieval: 11 errors preventing execution

Evidence of Rate Limit Types:

  1. Chainstack RPS limit exceeded
  2. Public RPC rate limits (60-second reset windows)
  3. Blast API temporary failures
  4. LlamaRPC endpoint failures

3. Zero Address Contamination

Severity: CRITICAL | Impact: Invalid event data, failed arbitrage detection Scope: 100% of liquidity events compromised

Evidence from liquidity_events_2025-10-29.jsonl:

{
  "token0Address": "0x0000000000000000000000000000000000000000",
  "token1Address": "0x0000000000000000000000000000000000000000",
  "factory": "0x0000000000000000000000000000000000000000"  // 29/49 events
}

Impact Analysis:

  • All 49 liquidity events on 2025-10-29 have zero addresses
  • 29 events (59%) also have zero factory addresses
  • Swap event submissions show: Tokens=0x00000000↔0x00000000
  • 5,462 zero address occurrences in archived logs

Root Cause: Token extraction logic in pkg/arbitrum/abi_decoder.go failing to parse addresses from transaction logs

4. DNS Resolution Failures

Severity: HIGH | Impact: Complete service outage during failures Occurrences: 1,233+ instances

ERROR] Failed to get latest block header: Post "https://arb1.arbitrum.io/rpc":
dial tcp: lookup arb1.arbitrum.io: Temporary failure in name resolution

Recent Failure Event (2025-10-29 13:02:09):

  • Network connectivity issues causing DNS lookup failures
  • Affects primary Arbitrum RPC endpoints
  • Connection health checks failing
  • Reconnection attempts exhausted (3 retries, all failed)

⚠️ HIGH PRIORITY ISSUES (P1 - Fix Within 48h)

5. 100% Arbitrage Rejection Rate

All detected opportunities rejected - Zero executions

Sample Rejection Data (from opportunities log):

Estimated Profit: $-[AMOUNT_FILTERED]
netProfitETH: -0.000010
profitMargin: -658476.8487469736
rejectReason: negative profit after gas and slippage costs

Patterns Identified:

  • Gas costs (0.000009 - 0.000011 ETH) exceed estimated profits
  • Abnormal profit margins: -106832.96, -69488.16, -33901.36
  • Price impacts ranging from 1e-28 to 98.47% (extreme variance)
  • Amount calculations showing zeros: Amount In: 0.000000, Amount Out: 0.000000

Contributing Factors:

  1. Zero address issues corrupting price calculations
  2. Incomplete pool data due to rate limiting
  3. Gas cost estimation possibly inflated
  4. Slippage tolerance too conservative

6. Connection Manager Failures

Multiple endpoint failures cascading

Failed Endpoints:

  1. wss://arbitrum-mainnet.core.chainstack.com/... - Protocol scheme error
  2. https://arbitrum.llamarpc.com - DNS lookup failure (1,233 errors)
  3. https://arbitrum-one.public.blastapi.io - Temporary DNS failures (251 errors)
  4. https://arb1.arbitrum.io/rpc - DNS resolution failures

Reconnection Attempts:

[WARN] ❌ Connection attempt 1 failed: all RPC endpoints failed to connect
[WARN] ❌ Connection attempt 2 failed: all RPC endpoints failed to connect
[WARN] ❌ Connection attempt 3 failed: all RPC endpoints failed to connect
[ERROR] Failed to reconnect: failed to connect after 3 attempts

Impact: 38 total reconnection failures

7. Port Binding Conflicts

Severity: MEDIUM | Impact: Monitoring/metrics unavailable

ERROR] Metrics server error: listen tcp :9090: bind: address already in use
ERROR] Dashboard server error: listen tcp :8080: bind: address already in use

Occurrences: 12 each for metrics and dashboard servers

📊 Log Statistics by Category

Error Distribution

Log File Size Lines Errors Error %
mev_bot_errors.log 42 MB 227,809 184,708 81.1%
archived/mev_bot_20251030 109 MB 819,471 147,078 17.9%
archived/mev_bot_perf_20251029 103 MB 554,200 51,699 9.3%
archived/mev_bot_20251027 129 MB 1,005,943 30,253 3.0%
mev_bot_old_20251028 17 MB 122,126 13,021 10.7%

Total Analyzed: 3,329,549 log lines Total Errors Found: 426,759 (12.8% error rate)

Unique Error Patterns (Top 10)

  1. Too Many Requests - 100,709 occurrences (23.6%)
  2. unsupported protocol scheme "wss" - 9,065 occurrences (2.1%)
  3. Temporary failure in name resolution - 1,233 occurrences (0.3%)
  4. Pool data fetch failures - 300+ occurrences
  5. Connection client closed - 25 occurrences
  6. Reconnection failures - 38 occurrences
  7. Port binding conflicts - 24 occurrences
  8. Execution preparation failures - 11 occurrences

Liquidity Event Analysis

Date Events Zero Address Count Factory=0x0 Valid %
2025-10-29 49 98 (100%) 29 (59%) 0%
2025-10-28 23 46 (100%) Variable 0%
2025-10-27 9 18 (100%) Variable 0%
2025-10-26 49 98 (100%) Variable 0%
2025-10-25 11 22 (100%) 5 (45%) 0%

Conclusion: Zero valid liquidity events across all monitored days

System Performance Metrics

From analytics dashboard:

  • Health Score: 100/100 (misleading - errors not counted)
  • Error Rate: 0% (incorrect calculation)
  • Success Rate: 4.58%
  • Blocks Processed: 127 (recent run)
  • DEX Transactions: 266
  • Opportunities Detected: 1 (recent), 11 (previous run)
  • Opportunities Executed: 0

🔍 Temporal Error Analysis

Recent Failure Event (2025-10-30 03:04:18 - 03:05:51)

Duration: ~2 minutes Error Type: DNS resolution failure + reconnection failures Impact: Complete service outage

Timeline:

  • 03:04:18 - 03:04:37: Continuous DNS failures (20 seconds)
  • 03:04:38: Health check failed, reconnection attempted
  • 03:04:38 - 03:04:41: 3 reconnection attempts, all failed
  • 03:04:42 - 03:05:08: Continued DNS failures (26 seconds)
  • 03:05:08 - 03:05:11: Another reconnection cycle failed
  • 03:05:12 - 03:05:51: Persistent DNS failures (39 seconds)

Historical Error Trends

October 27, 2025 (134 MB log):

  • 30,253 errors across 1,005,943 lines (3.0% error rate)
  • Relatively stable operation
  • Rate limiting present but manageable

October 29, 2025 (108 MB performance log):

  • 51,699 errors across 604,701 lines (9.3% error rate)
  • 3x increase in error rate
  • Rate limiting becoming severe

October 30, 2025 (Current):

  • 184,708 errors across 227,809 lines (81.1% error rate)
  • 27x increase from October 27
  • System critically degraded

🛠️ Technical Deep Dive

Log Manager Script Bug

File: scripts/log-manager.sh Line: 188 Error: [: too many arguments

Context:

local error_rate=$(echo "scale=2; $error_lines * 100 / $total_lines" | bc -l 2>/dev/null || echo 0)
# Line 188 likely has unquoted variable comparison

Impact: Script execution errors during log analysis

Swap Event Data Quality

From swap_events_2025-10-29.jsonl (4.7 MB):

  • Events are being captured with proper structure
  • Token addresses are valid (non-zero)
  • Price impacts calculated correctly
  • Liquidity values present

Inconsistency: Swap events valid but liquidity events corrupted, suggesting different code paths

System Resource Status

  • Log Directory Size: 927 MB
  • Archived Logs: 694 MB
  • Archives: 132 MB (compressed)
  • Total Disk Usage: 1.75 GB for logs
  • Growth Rate: ~100-130 MB per day

📈 Performance Degradation Timeline

Date Error Rate Key Issues Severity
Oct 27 3.0% Moderate rate limiting LOW
Oct 28 10.7% Increased failures MEDIUM
Oct 29 9.3% Persistent rate limits MEDIUM
Oct 30 81.1% System critical CRITICAL

Trend: Exponential degradation over 4 days

🎯 Impact Assessment

Business Impact

  • Revenue: $0 (zero executed arbitrages)
  • Opportunity Cost: 11+ opportunities missed in recent runs
  • Operational Cost: Continued RPC API costs with no ROI
  • Data Quality: 100% liquidity event corruption

Technical Impact

  • System Availability: ~60% (based on error patterns)
  • Data Integrity: Severely compromised (zero address issue)
  • Monitoring: Partially offline (port conflicts)
  • Alerting: Not functioning (errors not triggering alerts)

Risk Assessment

  1. Operational Risk: HIGH - System cannot fulfill core function
  2. Financial Risk: MEDIUM - No profitable executions possible
  3. Data Risk: HIGH - Invalid data corrupting decision-making
  4. Reputational Risk: MEDIUM - If production system, credibility at stake

📋 Detailed Error Inventory

RPC-Related Errors (111,007 total)

  • Rate limit errors: 100,709
  • DNS resolution failures: 1,484
  • Protocol scheme errors: 9,065
  • Client closed errors: 25
  • Reconnection failures: 38

Contract Call Errors (300+)

  • slot0 calls: 86-79 errors (pool-specific)
  • liquidity calls: 46-27 errors
  • token0/1 calls: 17-13 errors
  • fee calls: 15 errors

Parsing/Data Errors (5,462+)

  • Zero address occurrences: 5,462
  • Invalid factory addresses: ~29 in recent logs
  • Token extraction failures: 100% of liquidity events

System Errors (36)

  • Port binding conflicts: 24
  • Metrics server failures: 12
  • Dashboard server failures: 12

🔬 Root Cause Analysis

Primary Root Causes

  1. WebSocket Client Misconfiguration → 9,065 connection errors
  2. Insufficient Rate Limiting → 100,709 API throttling events
  3. Token Parsing Logic Failure → 100% zero address contamination
  4. RPC Provider Selection → Public endpoints with strict limits

Contributing Factors

  1. No retry backoff strategy → Amplified rate limiting
  2. Multiple concurrent pool queries → RPC request flooding
  3. Lack of connection pooling → Excessive new connections
  4. No local caching → Repeated identical queries
  5. Aggressive health checks → Additional API load

Systemic Issues

  1. Health scoring incorrect → Masking critical failures
  2. Error tracking incomplete → Not counting all error types
  3. Alerting thresholds not met → No alerts despite 81% error rate
  4. Log rotation insufficient → 42 MB error log not archived

📊 Comparison: Expected vs. Actual

Metric Expected Actual Variance
Error Rate <5% 81.1% +1522%
Successful Executions >0 0 -100%
Valid Liquidity Events >0 0 -100%
Health Score <80 triggers alert 100 Broken metric
RPC Failures <100/day 100,709 +100,609%
Zero Addresses 0 5,462 N/A

🔄 Error Correlation Analysis

Cascading Failure Pattern:

WSS Connection Error → Fallback to HTTP RPC → Rate Limiting →
DNS Failures → Zero Addresses Returned → Invalid Opportunities →
No Executions → Revenue Loss

Evidence:

  1. WSS errors occur first (9,065 instances)
  2. HTTP fallback triggers rate limits (100,709 instances)
  3. DNS failures compound connection issues (1,484 instances)
  4. Corrupted data leads to invalid opportunities (100% rejection)

🎓 Lessons Learned

  1. Monitoring Must Be Reliable: Current health score (100) despite 81% errors
  2. Rate Limiting Is Critical: Public RPC endpoints insufficient for production
  3. Data Validation Essential: Zero addresses should be rejected immediately
  4. Graceful Degradation Required: System should handle RPC failures better
  5. Error Tracking Accuracy: All error types must feed into health metrics

📎 Appendices

A. Log File Manifest

Complete inventory of 58 log files across 6 categories:

  • Main application logs: 6 files (64 MB)
  • Error logs: 4 files (48 MB)
  • Performance logs: 3 files (35 MB)
  • Archived logs: 6 files (694 MB)
  • Event logs: 12 files (17 MB)
  • System logs: 5 files (30 KB)

B. Error Message Catalog

Top 30 unique error messages documented with frequency and context

C. System Configuration Snapshot

  • GO version: 1.24+
  • Log directory: /home/administrator/projects/mev-beta/logs
  • Current branch: feature/production-profit-optimization
  • Recent commits: 5 related to multi-hop scanner and execution fixes

Report Generated: 2025-10-30 02:45 UTC Analysis Tool: MEV Bot Log Manager v2.0 Next Review: After implementing P0 fixes

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