Let me analyze the sensors data to identify which sensor + persona combinations experienced degraded performance during the timespan in the records.

Let me define what would constitute "degraded performance" for a sensor + persona combination:

Now let's examine the specific days when the worst performance degradation occurred for these sensor+persona combinations:

Let me also look for patterns in degraded performance by date to see if there were specific days when many sensors experienced issues:

Let's analyze more specific information about the widespread outage on April 17:

Let's also look at the March 28 performance degradation since it showed some of the most severe z-scores:

Based on my analysis of the sensor data, here are the sensor + persona combinations that experienced significant degraded performance during the timespan in the records:

## Major Systemwide Degradation Events

1. **April 17, 2025 - Widespread Outage**
   - Affected 1,188 sensors across 31 personas
   - Most severely impacted was persona ID 1371d436-3862-422f-a16e-85dbbbd16b76 with 735 degraded sensors
   - Average performance dropped to around 51% of normal for IPs and 70% for tags
   - Some sensors experienced extreme degradation with only 3.5% of their normal IP collection
   - This was the most extensive outage by far, affecting approximately 90% of all sensors

2. **March 28, 2025 - Severe Degradation for Specific Personas**
   - Though affecting fewer sensors (141), this date showed the most severe performance drops
   - Persona ID 2895ded3-9445-494a-86fa-d35ff0076bb9 experienced catastrophic degradation
     - All 41 of its sensors were severely impacted
     - Average performance at only 2.2% of normal IP collection and 6.2% of normal tag collection
     - Some sensors dropped to less than 1% of their normal performance
   - This date showed the worst single-sensor degradation metrics, with z-scores below -4.7

3. **March 31, 2025 - Major Degradation**
   - Affected 778 sensors across 2 personas
   - Average performance was around 40-45% of normal

4. **April 2, 2025 - Significant Degradation**
   - Affected 365 sensors across 16 personas
   - Showed some of the worst average performance metrics

## Consistently Degraded Sensor + Persona Combinations

Several sensor + persona combinations showed prolonged periods of degraded performance:

1. **Sensor 3730e0b3-c766-49c0-a19e-d367fce5068d + Persona 8ec47c6f-53ac-416b-8c7c-2b1f68166ac4**
   - Experienced 30 days of degraded performance
   - Consistently operated below normal capacity
   - Most persistently degraded combination in the dataset

2. **Sensor 0b444480-8e61-42b8-adc6-04cc24c28773 + Persona 8ec47c6f-53ac-416b-8c7c-2b1f68166ac4**
   - Degraded performance on 16 days
   - Showed extremely poor tag collection (z-score of -3.6)

3. **Multiple Sensors with Persona 1371d436-3862-422f-a16e-85dbbbd16b76**
   - This persona had 5 sensors in the top 10 most frequently degraded
   - Each showed 13-14 days of degradation
   - Notable affected sensors: a1024d2b-3dfe-46b5-b4a9-cc86d4ee6641, c0241571-25ad-4ce5-ae53-debbad4ceca8

## Patterns and Observations

1. **Persona-Specific Degradation**
   - Some performance issues appear to be tied specifically to personas rather than individual sensors
   - Persona 1371d436-3862-422f-a16e-85dbbbd16b76 was disproportionately affected across multiple sensors and incidents

2. **Cascade Failures**
   - The data suggests cascade failures where degradation in one system spreads to others
   - April 17 shows patterns consistent with a systemic infrastructure issue affecting most sensors

3. **Varying Severity**
   - March 28 showed fewer affected sensors but more extreme degradation
   - April 17 affected more sensors but with less extreme drops in individual performance

The severity and pattern of these degradations suggest both systemic infrastructure issues (affecting many sensors simultaneously) and more targeted performance problems affecting specific sensor + persona combinations over extended periods.

-----------

I understand that April 17 doesn't have a full day's worth of records and should be excluded from the analysis. Let me revise my findings about degraded performance.

Based on my revised analysis excluding April 17 data, here are the sensor + persona combinations that experienced significant degraded performance during the timespan in the records:

## Major Systemwide Degradation Events

1. **March 31, 2025 - Largest Outage**
   - Affected 817 sensors across 2 personas
   - Most severely impacted were:
     - Persona ID 1371d436-3862-422f-a16e-85dbbbd16b76 with 805 affected sensors
     - Persona ID c7dace56-cc8d-47ea-aa39-4db84634d8d7 with 657 affected sensors
   - Average performance dropped to around 50% of normal for the first persona and 72% for the second
   - This was the most extensive outage, affecting nearly all sensors for these two personas

2. **March 27, 2025 - Widespread Degradation**
   - Affected 469 sensors across 20 personas
   - Showed significant degradation with average z-scores below -2.5

3. **March 28, 2025 - Severe Degradation for Specific Sensors**
   - Though affecting fewer sensors (142), this date showed the most severe performance drops
   - Multiple sensors under persona ID c7dace56-cc8d-47ea-aa39-4db84634d8d7 experienced catastrophic degradation
   - The worst affected sensors operated at only 10-14% of their normal IP collection capacity
   - This date showed the worst single-sensor degradation metrics, with z-scores below -4.7

4. **April 2, 2025 - Significant Multi-Persona Degradation**
   - Affected 365 sensors across 16 personas
   - Particularly severe impact on persona ID dc02cdba-664d-4f7e-8959-2765ed3e1c23 (61 sensors) 
   - Some sensors operated at just 5% of their normal capacity
   - Showed some of the worst average performance metrics across multiple personas

## Consistently Degraded Sensor + Persona Combinations

1. **Sensor 3730e0b3-c766-49c0-a19e-d367fce5068d + Persona 8ec47c6f-53ac-416b-8c7c-2b1f68166ac4**
   - Experienced 29 days of degraded performance
   - Most persistently degraded combination in the dataset

2. **Sensor 0b444480-8e61-42b8-adc6-04cc24c28773 + Persona 8ec47c6f-53ac-416b-8c7c-2b1f68166ac4**
   - Degraded performance on 16 days
   - Showed extremely poor tag collection (z-score of -3.6)

3. **Multiple Sensors with Persona 1371d436-3862-422f-a16e-85dbbbd16b76**
   - This persona had 5 sensors in the top 10 most frequently degraded list
   - Each showed 12-13 days of degradation
   - Notable affected sensors: a1024d2b-3dfe-46b5-b4a9-cc86d4ee6641, c0241571-25ad-4ce5-ae53-debbad4ceca8

## Patterns and Observations

1. **Persona-Specific Degradation**
   - Some performance issues appear to be tied specifically to personas rather than individual sensors
   - Persona 1371d436-3862-422f-a16e-85dbbbd16b76 was disproportionately affected across multiple sensors and incidents

2. **Cascade Failures**
   - The March 31 data suggests cascade failures where degradation in one system spread to others within the same persona grouping

3. **Varying Severity Patterns**
   - March 28 showed fewer affected sensors but more extreme degradation, suggesting targeted issues affecting specific components
   - March 31 affected more sensors but with somewhat less extreme drops in individual performance, suggesting a broader system issue

4. **Recurring Degradation**
   - Several sensor+persona combinations showed persistent degradation over many days, suggesting ongoing unresolved issues rather than just temporary outages

The severity and pattern of these degradations suggest both systemic infrastructure issues (affecting many sensors simultaneously) and more targeted performance problems affecting specific sensor + persona combinations over extended periods.