In statistical objects In MXMetricPayload histogrammedTimeToFirstDrawKey start times not equal applicationExitMetrics exit

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Created Apr ’24

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In statistical objects In MXMetricPayload histogrammedTimeToFirstDrawKey start times not equal applicationExitMetrics exit：

case1:

       "applicationExitMetrics": {
            "backgroundExitData": {
                "cumulativeNormalAppExitCount": 3,
                "cumulativeMemoryPressureExitCount": 4
            },
            "foregroundExitData": {
                "cumulativeMemoryResourceLimitExitCount": 3
            }
        },
        "applicationLaunchMetrics": {
            "histogrammedTimeToFirstDrawKey": {
                "histogramNumBuckets": 14,
                "histogramValue": {
                    "10": {
                        "bucketCount": 1,
                        "bucketStart": "1740 ms",
                        "bucketEnd": "1749 ms"
                    },
                    "2": {
                        "bucketCount": 1,
                        "bucketStart": "1440 ms",
                        "bucketEnd": "1449 ms"
                    },
                    "3": {
                        "bucketCount": 2,
                        "bucketStart": "1490 ms",
                        "bucketEnd": "1499 ms"
                    },
                    "11": {
                        "bucketCount": 1,
                        "bucketStart": "1780 ms",
                        "bucketEnd": "1789 ms"
                    },
                    "4": {
                        "bucketCount": 1,
                        "bucketStart": "1500 ms",
                        "bucketEnd": "1509 ms"
                    },
                    "5": {
                        "bucketCount": 1,
                        "bucketStart": "1580 ms",
                        "bucketEnd": "1589 ms"
                    },
                    "12": {
                        "bucketCount": 1,
                        "bucketStart": "1860 ms",
                        "bucketEnd": "1869 ms"
                    },
                    "6": {
                        "bucketCount": 1,
                        "bucketStart": "1620 ms",
                        "bucketEnd": "1629 ms"
                    },
                    "13": {
                        "bucketCount": 1,
                        "bucketStart": "1990 ms",
                        "bucketEnd": "1999 ms"
                    },
                    "7": {
                        "bucketCount": 1,
                        "bucketStart": "1650 ms",
                        "bucketEnd": "1659 ms"
                    },
                    "0": {
                        "bucketCount": 1,
                        "bucketStart": "1400 ms",
                        "bucketEnd": "1409 ms"
                    },
                    "8": {
                        "bucketCount": 1,
                        "bucketStart": "1660 ms",
                        "bucketEnd": "1669 ms"
                    },
                    "1": {
                        "bucketCount": 1,
                        "bucketStart": "1430 ms",
                        "bucketEnd": "1439 ms"
                    },
                    "9": {
                        "bucketCount": 1,
                        "bucketStart": "1730 ms",
                        "bucketEnd": "1739 ms"
                    }
                }
            },

In this Case the app cold started 15 times, but quit only 10 times， why？？

case2:

      "applicationExitMetrics": {
            "backgroundExitData": {
                "cumulativeMemoryPressureExitCount": 1
            },
            "foregroundExitData": {
                "cumulativeMemoryResourceLimitExitCount": 3,
                "cumulativeNormalAppExitCount": 1
            }
        },
 
        "applicationLaunchMetrics": {
            "histogrammedTimeToFirstDrawKey": {
                "histogramNumBuckets": 3,
                "histogramValue": {
                    "0": {
                        "bucketCount": 1,
                        "bucketStart": "1490 ms",
                        "bucketEnd": "1499 ms"
                    },
                    "1": {
                        "bucketCount": 1,
                        "bucketStart": "1680 ms",
                        "bucketEnd": "1689 ms"
                    },
                    "2": {
                        "bucketCount": 1,
                        "bucketStart": "1880 ms",
                        "bucketEnd": "1889 ms"
                    }
                }
            },

The app cold started 3 times, but quit unexpectedly reached 5 times， why？？？

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Answer 1

chao99 OP

2w

We have a relevant problem.

We record process launches in a database in App, and we found the total number of processes in one day recorded by us is not equal to that in the corresponding applicationExitMetrics often. I understand that the numbers should not be same always, since we have different standards of counting. However, sometimes the difference is quite significant. For example, we record 10 exits, but applicationExitMetrics only contains 5. I suspect that exitMetrics may omit some launches in some particular conditions. But I can't figure out the exact logic to explain the gap.

If some insight regarding the mismatch can be provided, it will be much appreciated.

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