APPLICATIONINSIGHTS_CONNECTION_STRING does not work in 3.5.x, works in 3.4.x

[mercer]

Expected behavior

APPLICATIONINSIGHTS_CONNECTION_STRING works in 3.5.x

Actual behavior

APPLICATIONINSIGHTS_CONNECTION_STRING does not work in 3.5.x (tried 3.5.0, 3.5.1, 3.5.2)

To Reproduce

1. add dependency com.microsoft.azure:applicationinsights-runtime-attach:3.4.19
2. add applicationinsights.json in src/resources, see bellow
3. provide connection string via APPLICATIONINSIGHTS_CONNECTION_STRING environment variable
4. attach to agent via ApplicationInsights.attach();
5. start app
6. agent connects to appinsights, traces are sent to apinsights; we had this setup for more than 1 year
7. upgrade to com.microsoft.azure:applicationinsights-runtime-attach:3.5.2
8. start app (no other changes, no changes to applicationinsights.json)
9. agent does not connect, see error bellow in app console

*************************
Application Insights Java Agent 3.5.2 startup failed (PID 46492)
*************************

Description:
Error loading connection string from a file ("unknown-from-application-insights-json").
Please use this format instead:
{ "connectionString": "${file:connection-string-file.txt}" }


Action:
Learn more about configuration options here: https://go.microsoft.com/fwlink/?linkid=2153358

System information

Please provide the following information:

• SDK Version: 3.5.x
• OS type and version: Mac M2
• Application Server type and version (if applicable):
• Using spring-boot? yes
• Additional relevant libraries (with version, if applicable):

Logs

2023-05-30 17:02:01.940+03:00 ERROR c.m.applicationinsights.agent - Application Insights Java Agent 3.4.13 startup failed (PID 20200)
java.lang.IllegalArgumentException: Missing 'InstrumentationKey'
	at com.azure.monitor.opentelemetry.exporter.implementation.configuration.ConnectionStringBuilder.mapToConnectionConfiguration(ConnectionStringBuilder.java:85)
	at com.azure.monitor.opentelemetry.exporter.implementation.configuration.ConnectionStringBuilder.setConnectionString(ConnectionStringBuilder.java:39)
	at com.azure.monitor.opentelemetry.exporter.implementation.configuration.ConnectionString.lambda$parse$0(ConnectionString.java:37)
	at java.base/java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1708)

{
  "connectionString": "unknown-from-application-insights-json",
  "role": {
    "name": "app-role"
  },
  "sampling": {
    "percentage": 100
  },
  "instrumentation": {
    "logging": {
      "level": "INFO"
    }
  },
  "preview": {
    "processors": [
      {
        "type": "attribute",
        "actions": [
          {
            "key": "http.url",
            "pattern": "^(.*)(?<pii>[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\\.[a-zA-Z]{2,4})(.*)",
            "action": "extract"
          }
        ]
      },
      {
        "type": "attribute",
        "include": {
          "matchType": "strict",
          "attributes": [
            {
              "key": "pii"
            }
          ]
        },
        "actions": [
          {
            "key": "http.url",
            "action": "hash"
          },
          {
            "key": "pii",
            "action": "delete"
          }
        ]
      }
    ],
    "sampling": {
      "overrides": [
        {
          "telemetryType": "request",
          "attributes": [
            {
              "key": "http.url",
              "value": ".*/actuator/health.*",
              "matchType": "regexp"
            }
          ],
          "percentage": 0
        },
        {
          "telemetryType": "request",
          "attributes": [
            {
              "key": "http.url",
              "value": ".*/actuator/dbcheck.*",
              "matchType": "regexp"
            }
          ],
          "percentage": 0
        },
        {
          "telemetryType": "dependency",
          "attributes": [
            {
              "key": "db.system",
              "value": "mssql",
              "matchType": "strict"
            }
          ],
          "percentage": 50
        }
      ]
    }
  }
}