feat(logging): gcp error reporting (#11355)

# Which Problems Are Solved

Zitadel Errors (`zerrors` package) are logged by default. This change
add more verbose error reporting through log output, including
compatibility with GCP error reporting if enabled.

# How the Problems Are Solved

Errors can now carry their "report location" and a stack trace. "Report
location" is enabled by default, while stack-traces are disabled. Our
new [`zitadel/sloggcp`](https://github.com/zitadel/sloggcp) package
provides the GCP error reporting handler for `slog`.

The following section displays the different formats for the same error
(User not found). Newlines and formatting of output is applied for
readability and is not part of the actual log output.

<details>

<summary>Default text output</summary>

```
time=2026-01-15T14:27:20.625+01:00
level=WARN
source=/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/gerrors/zitadel_errors.go:57
msg="User could not be found (COMMAND-bd4ir1mblj)"
domain.instance_host=localhost:8080
domain.protocol=http
protocol=connect
service=zitadel.user.v2.UserService
http_method=POST
path=/zitadel.user.v2.UserService/DeleteUser
request_id=d5keme0ednc50mm74bfg
duration=66.761569ms
TraceID=319374baa56acc2dbd1d0179f1bbec9f
SpanID=541621b0abea7ff1
err.kind=NotFound
err.message="User could not be found"
err.id=COMMAND-bd4ir1mblj
err.reportLocation.filePath=/home/tim/Repositories/zitadel/zitadel/internal/command/user_v2.go
err.reportLocation.lineNumber=140
err.reportLocation.functionName=github.com/zitadel/zitadel/internal/command.(*Commands).RemoveUserV2
```

</details>

<details>

<summary>Default JSON output</summary>

```json
{
  "time": "2026-01-15T14:30:59.280497754+01:00",
  "level": "WARN",
  "source": {
    "function": "github.com/zitadel/zitadel/internal/api/grpc/gerrors.ZITADELToConnectError",
    "file": "/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/gerrors/zitadel_errors.go",
    "line": 57
  },
  "msg": "User could not be found (COMMAND-bd4ir1mblj)",
  "domain": { "instance_host": "localhost:8080", "protocol": "http" },
  "protocol": "connect",
  "service": "zitadel.user.v2.UserService",
  "http_method": "POST",
  "path": "/zitadel.user.v2.UserService/DeleteUser",
  "request_id": "d5keo4oednc6klmo3vbg",
  "duration": 54229055,
  "TraceID": "daa21183bd8da5da56969b0ea45f4388",
  "SpanID": "70da728e3086c104",
  "err": {
    "kind": "NotFound",
    "message": "User could not be found",
    "id": "COMMAND-bd4ir1mblj",
    "reportLocation": {
      "filePath": "/home/tim/Repositories/zitadel/zitadel/internal/command/user_v2.go",
      "lineNumber": 140,
      "functionName": "github.com/zitadel/zitadel/internal/command.(*Commands).RemoveUserV2"
    }
  }
}
```

</details>

When stack trace is enabled, using a standard logger,
it is logged under the `stackTrace` key.

<details>

<summary>Standard JSON format with stack trace</summary>

```json
{
  "time": "2026-01-15T14:36:56.522692368+01:00",
  "level": "WARN",
  "source": {
    "function": "github.com/zitadel/zitadel/internal/api/grpc/gerrors.ZITADELToConnectError",
    "file": "/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/gerrors/zitadel_errors.go",
    "line": 57
  },
  "msg": "User could not be found (COMMAND-bd4ir1mblj)",
  "domain": { "instance_host": "localhost:8080", "protocol": "http" },
  "protocol": "connect",
  "service": "zitadel.user.v2.UserService",
  "http_method": "POST",
  "path": "/zitadel.user.v2.UserService/DeleteUser",
  "request_id": "d5kequ0ednc7lphvgfn0",
  "duration": 57820793,
  "TraceID": "1b05d2b01306f2a64feb1a24b65a89c5",
  "SpanID": "c5ff35a27a917764",
  "err": {
    "kind": "NotFound",
    "message": "User could not be found",
    "id": "COMMAND-bd4ir1mblj",
    "reportLocation": {
      "filePath": "/home/tim/Repositories/zitadel/zitadel/internal/command/user_v2.go",
      "lineNumber": 140,
      "functionName": "github.com/zitadel/zitadel/internal/command.(*Commands).RemoveUserV2"
    },
    "stackTrace": "goroutine 673 [running]:\nruntime/debug.Stack()\n\t/usr/lib/go/src/runtime/debug/stack.go:26 +0x8e\ngithub.com/zitadel/zitadel/internal/zerrors.newZitadelError(0x5, {0x0, 0x0}, {0x6af7719, 0x12}, {0x6aff994, 0x14})\n\t/home/tim/Repositories/zitadel/zitadel/internal/zerrors/zerror.go:139 +0x1df\ngithub.com/zitadel/zitadel/internal/zerrors.ThrowNotFound({0x0, 0x0}, {0x6af7719, 0x12}, {0x6aff994, 0x14})\n\t/home/tim/Repositories/zitadel/zitadel/internal/zerrors/not_found.go:6 +0x70\ngithub.com/zitadel/zitadel/internal/command.(*Commands).RemoveUserV2(0xc0035a4008, {0xa3c1410, 0xc003ded5c0}, {0xc0029693a0, 0x3}, {0x0, 0x0}, {0xd550a60, 0x0, 0x0}, ...)\n\t/home/tim/Repositories/zitadel/zitadel/internal/command/user_v2.go:140 +0x711\ngithub.com/zitadel/zitadel/internal/api/grpc/user/v2.(*Server).DeleteUser(0xc00272d080, {0xa3c1410, 0xc003ded5c0}, 0xc002ebf180)\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/user/v2/user.go:191 +0x3f1\nconnectrpc.com/connect.NewUnaryHandler[...].func1({0xa405e70, 0xc002ebf180})\n\t/home/tim/go/pkg/mod/connectrpc.com/connect@v1.19.1/handler.go:51 +0x17e\nconnectrpc.com/connect.unaryThunk.func1({0xa3c1410, 0xc003ded5c0}, {0xa405e70, 0xc002ebf180})\n\t/home/tim/go/pkg/mod/connectrpc.com/connect@v1.19.1/interceptor.go:120 +0xd9\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.ActivityInterceptor.func1.1({0xa3c1410, 0xc003ded5c0}, {0xa405e70, 0xc002ebf180})\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/activity_interceptor.go:20 +0x1b1\nconnectrpc.com/connect.unaryThunk.func1({0xa3c1410, 0xc003ded4d0}, {0xa405e70, 0xc002ebf180})\n\t/home/tim/go/pkg/mod/connectrpc.com/connect@v1.19.1/interceptor.go:120 +0xd9\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.ServiceHandler.func1.1({0xa3c1410, 0xc003ded4d0}, {0xa405e70, 0xc002ebf180})\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/service_interceptor.go:22 +0x283\nconnectrpc.com/connect.unaryThunk.func1({0xa3c1410, 0xc003ded4d0}, {0xa405e70, 0xc002ebf180})\n\t/home/tim/go/pkg/mod/connectrpc.com/connect@v1.19.1/interceptor.go:120 +0xd9\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.validate({0xa3c1410, 0xc003ded4d0}, {0xa405e70, 0xc002ebf180}, 0xc0031bff60)\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/validation_interceptor.go:35 +0x1bd\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.ValidationHandler.func1.1({0xa3c1410, 0xc003ded4d0}, {0xa405e70, 0xc002ebf180})\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/validation_interceptor.go:15 +0x85\nconnectrpc.com/connect.unaryThunk.func1({0xa3c1410, 0xc003ded4d0}, {0xa405e70, 0xc002ebf180})\n\t/home/tim/go/pkg/mod/connectrpc.com/connect@v1.19.1/interceptor.go:120 +0xd9\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.ExecutionHandler.func1.1({0xa3c1410, 0xc003ded4d0}, {0xa405e70, 0xc002ebf180})\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/execution_interceptor.go:39 +0x376\nconnectrpc.com/connect.unaryThunk.func1({0xa3c1410, 0xc003ded4d0}, {0xa405e70, 0xc002ebf180})\n\t/home/tim/go/pkg/mod/connectrpc.com/connect@v1.19.1/interceptor.go:120 +0xd9\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.QuotaExhaustedInterceptor.func1.1({0xa3c1410, 0xc003ded4d0}, {0xa405e70, 0xc002ebf180})\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/quota_interceptor.go:25 +0x42d\nconnectrpc.com/connect.unaryThunk.func1({0xa3c1410, 0xc003ded4d0}, {0xa405e70, 0xc002ebf180})\n\t/home/tim/go/pkg/mod/connectrpc.com/connect@v1.19.1/interceptor.go:120 +0xd9\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.TranslationHandler.func1.1({0xa3c1410, 0xc003ded4d0}, {0xa405e70, 0xc002ebf180})\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/translation_interceptor.go:18 +0x94\nconnectrpc.com/connect.unaryThunk.func1({0xa3c1410, 0xc003ded4d0}, {0xa405e70, 0xc002ebf180})\n\t/home/tim/go/pkg/mod/connectrpc.com/connect@v1.19.1/interceptor.go:120 +0xd9\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.authorize({0xa3c1410, 0xc003dec000}, {0xa405e70, 0xc002ebf180}, 0xc00321c040, {0xa3f0a70, 0xc0004ebc70}, {{0xc000d2fc80, 0x9, 0x9}}, ...)\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/auth_interceptor.go:42 +0x894\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.AuthorizationInterceptor.func1.1({0xa3c1410, 0xc003dec000}, {0xa405e70, 0xc002ebf180})\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/auth_interceptor.go:17 +0x151\nconnectrpc.com/connect.unaryThunk.func1({0xa3c1410, 0xc003dec000}, {0xa405e70, 0xc002ebf180})\n\t/home/tim/go/pkg/mod/connectrpc.com/connect@v1.19.1/interceptor.go:120 +0xd9\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.LimitsInterceptor.func1.1({0xa3c1410, 0xc003dec000}, {0xa405e70, 0xc002ebf180})\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/limits_interceptor.go:31 +0x3b7\nconnectrpc.com/connect.unaryThunk.func1({0xa3c1410, 0xc003dec000}, {0xa405e70, 0xc002ebf180})\n\t/home/tim/go/pkg/mod/connectrpc.com/connect@v1.19.1/interceptor.go:120 +0xd9\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.toConnectError({0xa3c1410, 0xc003dec000}, {0xa405e70, 0xc002ebf180}, 0xc00321c060)\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/error_interceptor.go:21 +0x8a\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.ErrorHandler.func1.1({0xa3c1410, 0xc003dec000}, {0xa405e70, 0xc002ebf180})\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/error_interceptor.go:15 +0x85\nconnectrpc.com/connect.unaryThunk.func1({0xa3c1410, 0xc003dec000}, {0xa405e70, 0xc002ebf180})\n\t/home/tim/go/pkg/mod/connectrpc.com/connect@v1.19.1/interceptor.go:120 +0xd9\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.AccessStorageInterceptor.func1.1({0xa3c1410, 0xc003dec000}, {0xa405e70, 0xc002ebf180})\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/access_interceptor.go:21 +0x814\nconnectrpc.com/connect.unaryThunk.func1({0xa3c1410, 0xc003dec000}, {0xa405e70, 0xc002ebf180})\n\t/home/tim/go/pkg/mod/connectrpc.com/connect@v1.19.1/interceptor.go:120 +0xd9\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.addInstanceByRequestedHost({0xa3c1410, 0xc003db1110}, {0xa405e70, 0xc002ebf180}, 0xc00321c090, {0xa3a63e8, 0xc0002f4a00}, 0xc002dee9b0, {0xc0012106a0, 0x9})\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/instance_interceptor.go:107 +0xbc3\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.setInstance({0xa3c1410, 0xc003db10e0}, {0xa405e70, 0xc002ebf180}, 0xc00321c090, {0xa3a63e8, 0xc0002f4a00}, {0xc0012106a0, 0x9}, 0xc002dee9b0, ...)\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/instance_interceptor.go:61 +0xb05\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.InstanceInterceptor.func1.1({0xa3c1410, 0xc003db10e0}, {0xa405e70, 0xc002ebf180})\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/instance_interceptor.go:23 +0x147\nconnectrpc.com/connect.unaryThunk.func1({0xa3c1410, 0xc003db10e0}, {0xa405e70, 0xc002ebf180})\n\t/home/tim/go/pkg/mod/connectrpc.com/connect@v1.19.1/interceptor.go:120 +0xd9\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.NoCacheInterceptor.func1.1({0xa3c1410, 0xc003db10e0}, {0xa405e70, 0xc002ebf180})\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/cache_interceptor.go:21 +0x351\nconnectrpc.com/connect.unaryThunk.func1({0xa3c1410, 0xc003db10e0}, {0xa405e70, 0xc002ebf180})\n\t/home/tim/go/pkg/mod/connectrpc.com/connect@v1.19.1/interceptor.go:120 +0xd9\ngithub.com/zitadel/zitadel/backend/v3/instrumentation/logging.NewConnectInterceptor.func1({0xa3c1410, 0xc003db10e0}, {0xa405e70, 0xc002ebf180})\n\t/home/tim/Repositories/zitadel/zitadel/backend/v3/instrumentation/logging/connect_handler.go:26 +0x27b\nconnectrpc.com/connect.unaryThunk.func1({0xa3c1410, 0xc003db1050}, {0xa405e70, 0xc002ebf180})\n\t/home/tim/go/pkg/mod/connectrpc.com/connect@v1.19.1/interceptor.go:120 +0xd9\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.RegisterMetrics({0xa3c1410, 0xc003db1050}, {0xa405e70, 0xc002ebf180}, 0xc00321c0d0, {0xcf754f8, 0x3, 0x3}, {0xc0008b8840, 0x4, ...})\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/metrics_interceptor.go:47 +0x3f3\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.MetricsHandler.func1.1({0xa3c1410, 0xc003db1050}, {0xa405e70, 0xc002ebf180})\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/metrics_interceptor.go:31 +0x111\nconnectrpc.com/connect.unaryThunk.func1({0xa3c1410, 0xc003db1050}, {0xa405e70, 0xc002ebf180})\n\t/home/tim/go/pkg/mod/connectrpc.com/connect@v1.19.1/interceptor.go:120 +0xd9\nconnectrpc.com/otelconnect.(*Interceptor).WrapUnary.func1({0xa3c1410, 0xc003db1050}, {0xa405e70, 0xc002ebf180})\n\t/home/tim/go/pkg/mod/connectrpc.com/otelconnect@v0.8.0/interceptor.go:145 +0x16d7\nconnectrpc.com/connect.unaryThunk.func1({0xa3c1410, 0xc003db0ff0}, {0xa405e70, 0xc002ebf180})\n\t/home/tim/go/pkg/mod/connectrpc.com/connect@v1.19.1/interceptor.go:120 +0xd9\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.CallDurationHandler.func1.1({0xa3c1410, 0xc003db0ff0}, {0xa405e70, 0xc002ebf180})\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/call_interceptor.go:15 +0xab\nconnectrpc.com/connect.NewUnaryHandler[...].func2({0x7f11083fe700, 0xc000503a40})\n\t/home/tim/go/pkg/mod/connectrpc.com/connect@v1.19.1/handler.go:78 +0x4e2\nconnectrpc.com/connect.(*Handler).ServeHTTP(0xc0004dd420, {0xa3bb420, 0xc0006b22a0}, 0xc002e3b2c0)\n\t/home/tim/go/pkg/mod/connectrpc.com/connect@v1.19.1/handler.go:333 +0x870\ngithub.com/zitadel/zitadel/pkg/grpc/user/v2/userconnect.NewUserServiceHandler.func1({0xa3bb420, 0xc0006b22a0}, 0xc002e3b2c0)\n\t/home/tim/Repositories/zitadel/zitadel/pkg/grpc/user/v2/userconnect/user_service.connect.go:1951 +0x8e5\nnet/http.HandlerFunc.ServeHTTP(0xc002d7a000, {0xa3bb420, 0xc0006b22a0}, 0xc002e3b2c0)\n\t/usr/lib/go/src/net/http/server.go:2322 +0x33\ngithub.com/rs/cors.(*Cors).Handler.func1({0xa3bb420, 0xc0006b22a0}, 0xc002e3b2c0)\n\t/home/tim/go/pkg/mod/github.com/rs/cors@v1.11.1/cors.go:289 +0x2fd\nnet/http.HandlerFunc.ServeHTTP(0xc000191aa0, {0xa3bb420, 0xc0006b22a0}, 0xc002e3b2c0)\n\t/usr/lib/go/src/net/http/server.go:2322 +0x33\ngithub.com/zitadel/zitadel/internal/api/http/middleware.RobotsTagHandler.func1({0xa3bb420, 0xc0006b22a0}, 0xc002e3b2c0)\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/http/middleware/robots_tag_interceptor.go:12 +0x88\nnet/http.HandlerFunc.ServeHTTP(0xc002e14798, {0xa3bb420, 0xc0006b22a0}, 0xc002e3b2c0)\n\t/usr/lib/go/src/net/http/server.go:2322 +0x33\ngithub.com/zitadel/zitadel/internal/api/http/middleware.WithOrigin.func1.1({0xa3bb420, 0xc0006b22a0}, 0xc002e3b180)\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/http/middleware/origin_interceptor.go:27 +0x42a\nnet/http.HandlerFunc.ServeHTTP(0xc003d89a40, {0xa3bb420, 0xc0006b22a0}, 0xc002e3b180)\n\t/usr/lib/go/src/net/http/server.go:2322 +0x33\ngithub.com/gorilla/mux.(*Router).ServeHTTP(0xc002dfa840, {0xa3bb420, 0xc0006b22a0}, 0xc002e3b180)\n\t/home/tim/go/pkg/mod/github.com/gorilla/mux@v1.8.1/mux.go:212 +0x2bb\ngolang.org/x/net/http2.(*serverConn).runHandler(0xc003e143c0, 0xc0006b22a0, 0xc0002f4000, 0xc002d9ae88)\n\t/home/tim/go/pkg/mod/golang.org/x/net@v0.47.0/http2/server.go:2424 +0x1b9\ncreated by golang.org/x/net/http2.(*serverConn).scheduleHandler in goroutine 607\n\t/home/tim/go/pkg/mod/golang.org/x/net@v0.47.0/http2/server.go:2359 +0x1df\n"
  }
}
```

</details>

When the GCP error reporting handler is enabled with stack trace, as per
[formatting
requirements](https://docs.cloud.google.com/error-reporting/docs/formatting-error-messages):
- A `@type` field is provided
- Some fields are renamed according to Google Cloud Logging specs.
(severity, message etc)
- The stack strace is appended to the `message` field.
- The report location is moved into the top-level `reportLocation`
field.

The original error is still logged in the `error` field.
This is not part of the error reporting API but may still be useful for
logging.

<details>

<summary>GCP error report with stack trace</summary>

```json
{
  "@type": "type.googleapis.com/google.devtools.clouderrorreporting.v1beta1.ReportedErrorEvent",
  "SpanID": "4fdeae9817ade4f5",
  "TraceID": "78e31366d4c36e0718a2dcb6ca73d2f3",
  "domain": { "instance_host": "localhost:8080", "protocol": "http" },
  "duration": "82.464896ms",
  "error": {
    "id": "COMMAND-bd4ir1mblj",
    "kind": "NotFound",
    "message": "User could not be found"
  },
  "http_method": "POST",
  "logging.googleapis.com/sourceLocation": {
    "function": "github.com/zitadel/zitadel/internal/api/grpc/gerrors.ZITADELToConnectError",
    "file": "/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/gerrors/zitadel_errors.go",
    "line": 57
  },
  "message": "ID=COMMAND-bd4ir1mblj Message=User could not be found\ngoroutine 1165 [running]:\nruntime/debug.Stack()\n\t/usr/lib/go/src/runtime/debug/stack.go:26 +0x8e\ngithub.com/zitadel/zitadel/internal/zerrors.newZitadelError(0x5, {0x0, 0x0}, {0x6af7719, 0x12}, {0x6aff994, 0x14})\n\t/home/tim/Repositories/zitadel/zitadel/internal/zerrors/zerror.go:139 +0x1df\ngithub.com/zitadel/zitadel/internal/zerrors.ThrowNotFound({0x0, 0x0}, {0x6af7719, 0x12}, {0x6aff994, 0x14})\n\t/home/tim/Repositories/zitadel/zitadel/internal/zerrors/not_found.go:6 +0x70\ngithub.com/zitadel/zitadel/internal/command.(*Commands).RemoveUserV2(0xc000498588, {0xa3c1450, 0xc002cba540}, {0xc003030910, 0xb}, {0x0, 0x0}, {0xd550a80, 0x0, 0x0}, ...)\n\t/home/tim/Repositories/zitadel/zitadel/internal/command/user_v2.go:140 +0x711\ngithub.com/zitadel/zitadel/internal/api/grpc/user/v2.(*Server).DeleteUser(0xc003101500, {0xa3c1450, 0xc002cba540}, 0xc00216ec80)\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/user/v2/user.go:191 +0x3f1\nconnectrpc.com/connect.NewUnaryHandler[...].func1({0xa405eb0, 0xc00216ec80})\n\t/home/tim/go/pkg/mod/connectrpc.com/connect@v1.19.1/handler.go:51 +0x17e\nconnectrpc.com/connect.unaryThunk.func1({0xa3c1450, 0xc002cba540}, {0xa405eb0, 0xc00216ec80})\n\t/home/tim/go/pkg/mod/connectrpc.com/connect@v1.19.1/interceptor.go:120 +0xd9\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.ActivityInterceptor.func1.1({0xa3c1450, 0xc002cba540}, {0xa405eb0, 0xc00216ec80})\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/activity_interceptor.go:20 +0x1b1\nconnectrpc.com/connect.unaryThunk.func1({0xa3c1450, 0xc002cba330}, {0xa405eb0, 0xc00216ec80})\n\t/home/tim/go/pkg/mod/connectrpc.com/connect@v1.19.1/interceptor.go:120 +0xd9\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.ServiceHandler.func1.1({0xa3c1450, 0xc002cba330}, {0xa405eb0, 0xc00216ec80})\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/service_interceptor.go:22 +0x283\nconnectrpc.com/connect.unaryThunk.func1({0xa3c1450, 0xc002cba330}, {0xa405eb0, 0xc00216ec80})\n\t/home/tim/go/pkg/mod/connectrpc.com/connect@v1.19.1/interceptor.go:120 +0xd9\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.validate({0xa3c1450, 0xc002cba330}, {0xa405eb0, 0xc00216ec80}, 0xc003033180)\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/validation_interceptor.go:35 +0x1bd\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.ValidationHandler.func1.1({0xa3c1450, 0xc002cba330}, {0xa405eb0, 0xc00216ec80})\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/validation_interceptor.go:15 +0x85\nconnectrpc.com/connect.unaryThunk.func1({0xa3c1450, 0xc002cba330}, {0xa405eb0, 0xc00216ec80})\n\t/home/tim/go/pkg/mod/connectrpc.com/connect@v1.19.1/interceptor.go:120 +0xd9\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.ExecutionHandler.func1.1({0xa3c1450, 0xc002cba330}, {0xa405eb0, 0xc00216ec80})\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/execution_interceptor.go:39 +0x376\nconnectrpc.com/connect.unaryThunk.func1({0xa3c1450, 0xc002cba330}, {0xa405eb0, 0xc00216ec80})\n\t/home/tim/go/pkg/mod/connectrpc.com/connect@v1.19.1/interceptor.go:120 +0xd9\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.QuotaExhaustedInterceptor.func1.1({0xa3c1450, 0xc002cba330}, {0xa405eb0, 0xc00216ec80})\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/quota_interceptor.go:25 +0x42d\nconnectrpc.com/connect.unaryThunk.func1({0xa3c1450, 0xc002cba330}, {0xa405eb0, 0xc00216ec80})\n\t/home/tim/go/pkg/mod/connectrpc.com/connect@v1.19.1/interceptor.go:120 +0xd9\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.TranslationHandler.func1.1({0xa3c1450, 0xc002cba330}, {0xa405eb0, 0xc00216ec80})\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/translation_interceptor.go:18 +0x94\nconnectrpc.com/connect.unaryThunk.func1({0xa3c1450, 0xc002cba330}, {0xa405eb0, 0xc00216ec80})\n\t/home/tim/go/pkg/mod/connectrpc.com/connect@v1.19.1/interceptor.go:120 +0xd9\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.authorize({0xa3c1450, 0xc0015827b0}, {0xa405eb0, 0xc00216ec80}, 0xc0030331e0, {0xa3f0ab0, 0xc000203f10}, {{0xc000865980, 0x9, 0x9}}, ...)\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/auth_interceptor.go:42 +0x894\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.AuthorizationInterceptor.func1.1({0xa3c1450, 0xc0015827b0}, {0xa405eb0, 0xc00216ec80})\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/auth_interceptor.go:17 +0x151\nconnectrpc.com/connect.unaryThunk.func1({0xa3c1450, 0xc0015827b0}, {0xa405eb0, 0xc00216ec80})\n\t/home/tim/go/pkg/mod/connectrpc.com/connect@v1.19.1/interceptor.go:120 +0xd9\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.LimitsInterceptor.func1.1({0xa3c1450, 0xc0015827b0}, {0xa405eb0, 0xc00216ec80})\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/limits_interceptor.go:31 +0x3b7\nconnectrpc.com/connect.unaryThunk.func1({0xa3c1450, 0xc0015827b0}, {0xa405eb0, 0xc00216ec80})\n\t/home/tim/go/pkg/mod/connectrpc.com/connect@v1.19.1/interceptor.go:120 +0xd9\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.toConnectError({0xa3c1450, 0xc0015827b0}, {0xa405eb0, 0xc00216ec80}, 0xc003033200)\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/error_interceptor.go:21 +0x8a\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.ErrorHandler.func1.1({0xa3c1450, 0xc0015827b0}, {0xa405eb0, 0xc00216ec80})\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/error_interceptor.go:15 +0x85\nconnectrpc.com/connect.unaryThunk.func1({0xa3c1450, 0xc0015827b0}, {0xa405eb0, 0xc00216ec80})\n\t/home/tim/go/pkg/mod/connectrpc.com/connect@v1.19.1/interceptor.go:120 +0xd9\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.AccessStorageInterceptor.func1.1({0xa3c1450, 0xc0015827b0}, {0xa405eb0, 0xc00216ec80})\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/access_interceptor.go:21 +0x814\nconnectrpc.com/connect.unaryThunk.func1({0xa3c1450, 0xc0015827b0}, {0xa405eb0, 0xc00216ec80})\n\t/home/tim/go/pkg/mod/connectrpc.com/connect@v1.19.1/interceptor.go:120 +0xd9\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.addInstanceByRequestedHost({0xa3c1450, 0xc001636630}, {0xa405eb0, 0xc00216ec80}, 0xc003033230, {0xa3a6428, 0xc00069f040}, 0xc002076910, {0xc002cef510, 0x9})\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/instance_interceptor.go:107 +0xbc3\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.setInstance({0xa3c1450, 0xc0016365a0}, {0xa405eb0, 0xc00216ec80}, 0xc003033230, {0xa3a6428, 0xc00069f040}, {0xc002cef510, 0x9}, 0xc002076910, ...)\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/instance_interceptor.go:61 +0xb05\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.InstanceInterceptor.func1.1({0xa3c1450, 0xc0016365a0}, {0xa405eb0, 0xc00216ec80})\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/instance_interceptor.go:23 +0x147\nconnectrpc.com/connect.unaryThunk.func1({0xa3c1450, 0xc0016365a0}, {0xa405eb0, 0xc00216ec80})\n\t/home/tim/go/pkg/mod/connectrpc.com/connect@v1.19.1/interceptor.go:120 +0xd9\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.NoCacheInterceptor.func1.1({0xa3c1450, 0xc0016365a0}, {0xa405eb0, 0xc00216ec80})\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/cache_interceptor.go:21 +0x351\nconnectrpc.com/connect.unaryThunk.func1({0xa3c1450, 0xc0016365a0}, {0xa405eb0, 0xc00216ec80})\n\t/home/tim/go/pkg/mod/connectrpc.com/connect@v1.19.1/interceptor.go:120 +0xd9\ngithub.com/zitadel/zitadel/backend/v3/instrumentation/logging.NewConnectInterceptor.func1({0xa3c1450, 0xc0016365a0}, {0xa405eb0, 0xc00216ec80})\n\t/home/tim/Repositories/zitadel/zitadel/backend/v3/instrumentation/logging/connect_handler.go:26 +0x27b\nconnectrpc.com/connect.unaryThunk.func1({0xa3c1450, 0xc0016364e0}, {0xa405eb0, 0xc00216ec80})\n\t/home/tim/go/pkg/mod/connectrpc.com/connect@v1.19.1/interceptor.go:120 +0xd9\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.RegisterMetrics({0xa3c1450, 0xc0016364e0}, {0xa405eb0, 0xc00216ec80}, 0xc003033270, {0xcf754f8, 0x3, 0x3}, {0xc000530f60, 0x4, ...})\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/metrics_interceptor.go:47 +0x3f3\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.MetricsHandler.func1.1({0xa3c1450, 0xc0016364e0}, {0xa405eb0, 0xc00216ec80})\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/metrics_interceptor.go:31 +0x111\nconnectrpc.com/connect.unaryThunk.func1({0xa3c1450, 0xc0016364e0}, {0xa405eb0, 0xc00216ec80})\n\t/home/tim/go/pkg/mod/connectrpc.com/connect@v1.19.1/interceptor.go:120 +0xd9\nconnectrpc.com/otelconnect.(*Interceptor).WrapUnary.func1({0xa3c1450, 0xc0016364e0}, {0xa405eb0, 0xc00216ec80})\n\t/home/tim/go/pkg/mod/connectrpc.com/otelconnect@v0.8.0/interceptor.go:145 +0x16d7\nconnectrpc.com/connect.unaryThunk.func1({0xa3c1450, 0xc001636450}, {0xa405eb0, 0xc00216ec80})\n\t/home/tim/go/pkg/mod/connectrpc.com/connect@v1.19.1/interceptor.go:120 +0xd9\ngithub.com/zitadel/zitadel/internal/api/grpc/server/connect_middleware.CallDurationHandler.func1.1({0xa3c1450, 0xc001636450}, {0xa405eb0, 0xc00216ec80})\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/server/connect_middleware/call_interceptor.go:15 +0xab\nconnectrpc.com/connect.NewUnaryHandler[...].func2({0x7fb6100a8e60, 0xc002fa5680})\n\t/home/tim/go/pkg/mod/connectrpc.com/connect@v1.19.1/handler.go:78 +0x4e2\nconnectrpc.com/connect.(*Handler).ServeHTTP(0xc0040768c0, {0xa3bb460, 0xc0025bf360}, 0xc0024c23c0)\n\t/home/tim/go/pkg/mod/connectrpc.com/connect@v1.19.1/handler.go:333 +0x870\ngithub.com/zitadel/zitadel/pkg/grpc/user/v2/userconnect.NewUserServiceHandler.func1({0xa3bb460, 0xc0025bf360}, 0xc0024c23c0)\n\t/home/tim/Repositories/zitadel/zitadel/pkg/grpc/user/v2/userconnect/user_service.connect.go:1951 +0x8e5\nnet/http.HandlerFunc.ServeHTTP(0xc00314a200, {0xa3bb460, 0xc0025bf360}, 0xc0024c23c0)\n\t/usr/lib/go/src/net/http/server.go:2322 +0x33\ngithub.com/rs/cors.(*Cors).Handler.func1({0xa3bb460, 0xc0025bf360}, 0xc0024c23c0)\n\t/home/tim/go/pkg/mod/github.com/rs/cors@v1.11.1/cors.go:289 +0x2fd\nnet/http.HandlerFunc.ServeHTTP(0xc0022cbdc0, {0xa3bb460, 0xc0025bf360}, 0xc0024c23c0)\n\t/usr/lib/go/src/net/http/server.go:2322 +0x33\ngithub.com/zitadel/zitadel/internal/api/http/middleware.RobotsTagHandler.func1({0xa3bb460, 0xc0025bf360}, 0xc0024c23c0)\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/http/middleware/robots_tag_interceptor.go:12 +0x88\nnet/http.HandlerFunc.ServeHTTP(0xc001c8fae8, {0xa3bb460, 0xc0025bf360}, 0xc0024c23c0)\n\t/usr/lib/go/src/net/http/server.go:2322 +0x33\ngithub.com/zitadel/zitadel/internal/api/http/middleware.WithOrigin.func1.1({0xa3bb460, 0xc0025bf360}, 0xc0024c2140)\n\t/home/tim/Repositories/zitadel/zitadel/internal/api/http/middleware/origin_interceptor.go:27 +0x42a\nnet/http.HandlerFunc.ServeHTTP(0xc00048e540, {0xa3bb460, 0xc0025bf360}, 0xc0024c2140)\n\t/usr/lib/go/src/net/http/server.go:2322 +0x33\ngithub.com/gorilla/mux.(*Router).ServeHTTP(0xc00207c540, {0xa3bb460, 0xc0025bf360}, 0xc0024c2140)\n\t/home/tim/go/pkg/mod/github.com/gorilla/mux@v1.8.1/mux.go:212 +0x2bb\ngolang.org/x/net/http2.(*serverConn).runHandler(0xc0025545a0, 0xc0025bf360, 0xc0023fd180, 0xc001703488)\n\t/home/tim/go/pkg/mod/golang.org/x/net@v0.47.0/http2/server.go:2424 +0x1b9\ncreated by golang.org/x/net/http2.(*serverConn).scheduleHandler in goroutine 620\n\t/home/tim/go/pkg/mod/golang.org/x/net@v0.47.0/http2/server.go:2359 +0x1df\n",
  "path": "/zitadel.user.v2.UserService/DeleteUser",
  "protocol": "connect",
  "reportLocation": {
    "filePath": "/home/tim/Repositories/zitadel/zitadel/internal/command/user_v2.go",
    "lineNumber": 140,
    "functionName": "github.com/zitadel/zitadel/internal/command.(*Commands).RemoveUserV2"
  },
  "request_id": "d5kgsu8edncaon6puvag",
  "service": "zitadel.user.v2.UserService",
  "severity": "WARNING",
  "time": "2026-01-15T16:57:45.341000592+01:00"
}
```

</details>

When the GCP error reporting handler is enabled without stack trace,
the `message` field contains the error string, also as per formatting
requirements.

<details>

<summary>GCP error report without stack trace</summary>

```json
{
  "@type": "type.googleapis.com/google.devtools.clouderrorreporting.v1beta1.ReportedErrorEvent",
  "SpanID": "2b4157f874eddbf4",
  "TraceID": "c34f7404fc0d021e1868ccc687bf2995",
  "domain": { "instance_host": "localhost:8080", "protocol": "http" },
  "duration": "52.061597ms",
  "error": {
    "id": "COMMAND-bd4ir1mblj",
    "kind": "NotFound",
    "message": "User could not be found"
  },
  "http_method": "POST",
  "logging.googleapis.com/sourceLocation": {
    "function": "github.com/zitadel/zitadel/internal/api/grpc/gerrors.ZITADELToConnectError",
    "file": "/home/tim/Repositories/zitadel/zitadel/internal/api/grpc/gerrors/zitadel_errors.go",
    "line": 57
  },
  "message": "ID=COMMAND-bd4ir1mblj Message=User could not be found",
  "path": "/zitadel.user.v2.UserService/DeleteUser",
  "protocol": "connect",
  "reportLocation": {
    "filePath": "/home/tim/Repositories/zitadel/zitadel/internal/command/user_v2.go",
    "lineNumber": 140,
    "functionName": "github.com/zitadel/zitadel/internal/command.(*Commands).RemoveUserV2"
  },
  "request_id": "d5kf5tgedncaiajvls9g",
  "service": "zitadel.user.v2.UserService",
  "severity": "WARNING",
  "time": "2026-01-15T15:00:22.910899273+01:00"
}
```

</details>

# Additional Changes

- Private constructor for zitadel errors so that the stack-depth is
consistent for different ways of error creation. (Throw and Create
variants)
- Request logs are now always at info level.
- Bump Go version 1.25, required for `sloggcp`

# Additional Context

- closes #11329

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

.devcontainer/devcontainer.json

@@ -33,7 +33,7 @@
 	},
 	"features": {
 		"ghcr.io/devcontainers/features/go:1": {
-			"version": "1.24"
+			"version": "1.25"
 		},
 		"ghcr.io/devcontainers/features/docker-outside-of-docker": {},
 		"ghcr.io/schlich/devcontainer-features/cypress:1": {