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2
3# 🔍 APM Incident Investigation Report
4
5## Root Cause
6**This is NOT a production bug** — the \`FileNotFoundError\` is intentional test code designed to generate exceptions for APM monitoring validation.
7
8---
9
10## Evidence
11
12### **A) Error Identity**
13- **Exception Type**: \`FileNotFoundError\`
14- **Error Message**: \`[Errno 2] No such file or directory: 'nofile.txt'\`
15- **HTTP Status**: 500 (Internal Server Error)
16
17### **B) Stack Trace Analysis**
18**Application-owned frames (root cause chain):**
19
201. **\`/flask/test.py\` line 27** in \`file_not_found()\`:
21   \`\`\`python
22   def file_not_found(): open('nofile.txt')
23   \`\`\`
24   ➜ **PRIMARY CAUSE**: Attempts to open non-existent file
25
26### **F) Log Analysis (Critical Evidence)**
27
28**Correlated logs revealed:**
29- **2 trace-specific logs** for this exact request (INFO + ERROR)
30- **54 total ERROR logs** in the 10-minute incident window from the same service
31- **Multiple exception types** observed:
32  - \`FileNotFoundError\` (our incident)
33  - \`ZeroDivisionError\` (from \`/exception1\`)
34
35**Pattern**: Diverse, intentional exceptions from multiple test endpoints confirm this is an **APM test harness**, not a production failure.
36
37### **G) Repository Context**
38- **URL**: https://bitbucket.org/temp-mw/demo-apm-python-sanjay
39- **Type**: Demo/example code for APM Python testing
40- **Access**: Repository authentication unavailable, but stack traces in logs provide complete code context
41
42---
43
44## Suggested Fix
45
46### **Recommended Improvements: Documentation & Safety**
47
48Since this is test code that may confuse operators when alerts fire, add clarifying documentation and safety controls:
49
50#### **1. Add Module Documentation to \`/flask/test.py\`:**
51
52\`\`\`python
53# @@file: /flask/test.py
54"""
55APM Exception Testing Module
56============================
57This module intentionally generates various Python exceptions for testing
58Application Performance Monitoring (APM) and observability tools.
59
60⚠️ WARNING: This code is for TESTING ONLY. Do not use in production.
61"""
62
63import random
64import os
65
66ENABLE_EXCEPTION_TESTS = os.getenv('ENABLE_EXCEPTION_TESTS', 'true').lower() == 'true'
67
68
69def file_not_found():
70    """
71    Intentionally raises FileNotFoundError for testing.
72    NOTE: The file 'nofile.txt' is deliberately missing - DO NOT CREATE IT.
73    """
74    open('nofile.txt')  # Intentional error for APM testing
75\`\`\`
76
77
78\`\`\`mermaid
79sequenceDiagram
80    participant Team as Agno Team
81    participant Adapter as AgnoTeamAdapter
82    participant MW as MW events/outputs
83
84    Team->>Adapter: TeamToolCallStarted (delegate_task_to_member, tool_call_id=X)
85    Adapter->>Adapter: current_delegate_tool_call_id = X
86    Team->>

86Adapter: RunOutputEvent (member, no team_id)
87    Adapter->>MW: MWTeamOutputEvent(tool_call_id=X)
88    Team->>Adapter: ... more member events ...
89    Adapter->>MW: MWTeamOutputEvent(tool_call_id=X)
90    Team->>Adapter: TeamToolCallCompleted (tool_call_id=X)
91    Adapter->>Adapter: current_delegate_tool_call_id = None
92\`\`\`
93
94---
95
96## Summary
97
98| Attribute | Value |
99|-----------|-------|
100| **Incident Type** | Intentional test exception (not a bug) |
101| **Root Cause** | \`file_not_found()\` function designed to fail for APM testing |
102| **Service** | \`python-github-testing\` (test environment) |
103| **Impact** | None (expected behavior) |
104| **Action Required** | Optional documentation improvements only |
105| **Fix Status** | No fix needed — working as designed |
106
107### Inline chart citation (demo)
108
109Average CPU (sample): <<!!--<ref>##opsref_demo_chart_1--!!>>
110`,a={version:1,blocks:[{id:"chart-opsref_demo_chart_1",kind:"chart",citation_id:"opsref_demo_chart_1",reference_id:"opsref_demo_chart_1",title:"Sample CPU query",chart_source:"bifrost_query",tool_call_id:"tool_demo",bifrost_query:JSON.stringify({query_results:[{query_data:{series:[{name:"avg(system.cpu.utilization, value(avg))",data:[[177642315e4,4.11],[177642318e4,4.22],[177642321e4,3.85]],custom:{groups:[],metricName:"avg(system.cpu.utilization, value(avg))",config:{type:"percent",config:{precision:2,"progress-bar":!0}}}}],noDataFound:!1,timeRange:{fromTs:1776423170435,toTs:1776426770435,interval:30}},time_range:{fromTs:1776423170435,toTs:1776426770435,interval:30}}]}),tool_args:{queries:[{chartType:"time_series_chart",columns:[{aggregation_method:"avg",name:"system.cpu.utilization",rollup_method:"avg"}],filters:{},groupBy:[],resources:["host"],timeRange:{from:1776423170435,to:1776426770435}}]}}]},$=()=>{let t=`prometheus
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112--log.format=logfmt 
113--config.file=/etc/prometheus/prometheus.yml 
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