Here is data for Release: Storage key number of all storage initializations (roughly matches number of FF sessions): 27925 number of failed storage initializations: 838 success rate: 99.97% UpgradeFromIndexedDBDirectory key number of all storage upgrades: 1 success rate: 100% UpgradeFromPersistentStorageDirectory number of all storage upgrades: 13 success rate: 100% UpgradeStorageFrom0_0To1_0 number of all storage upgrades: 35 success rate: 100% UpgradeStorageFrom1_0To2_0 number of all storage upgrades: 46 number of failed storage initializations: 7 success rate: 84.78% UpgradeStorageFrom2_0To2_1 number of all storage upgrades: 46 success rate: 100% UpgradeStorageFrom2_1To2_2 number of all storage upgrades: 83 success rate: 100% UpgradeStorageFrom2_2To2_3 number of all storage upgrades: 116 success rate: 100% There are only 7 failed initializations for UpgradeStorageFrom1_0To2_0, but number of total failures is 838. It seems there can be something else which breaks the initialization and is not covered by individual keys.
Bug 1649393 Comment 14 Edit History
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Here is data for Release: Storage key number of all storage initializations (roughly matches number of FF sessions): 27925 number of failed storage initializations: 9 success rate: 99.97% UpgradeFromIndexedDBDirectory key number of all storage upgrades: 1 success rate: 100% UpgradeFromPersistentStorageDirectory number of all storage upgrades: 13 success rate: 100% UpgradeStorageFrom0_0To1_0 number of all storage upgrades: 35 success rate: 100% UpgradeStorageFrom1_0To2_0 number of all storage upgrades: 46 number of failed storage initializations: 7 success rate: 84.78% UpgradeStorageFrom2_0To2_1 number of all storage upgrades: 46 success rate: 100% UpgradeStorageFrom2_1To2_2 number of all storage upgrades: 83 success rate: 100% UpgradeStorageFrom2_2To2_3 number of all storage upgrades: 116 success rate: 100% There are only 7 failed initializations for UpgradeStorageFrom1_0To2_0, but number of total failures is 9. It seems there can be something else which breaks the initialization and is not covered by individual keys.
Here is data for Release 78: Storage key number of all storage initializations (roughly matches number of FF sessions): 27925 number of failed storage initializations: 9 success rate: 99.97% UpgradeFromIndexedDBDirectory key number of all storage upgrades: 1 success rate: 100% UpgradeFromPersistentStorageDirectory number of all storage upgrades: 13 success rate: 100% UpgradeStorageFrom0_0To1_0 number of all storage upgrades: 35 success rate: 100% UpgradeStorageFrom1_0To2_0 number of all storage upgrades: 46 number of failed storage initializations: 7 success rate: 84.78% UpgradeStorageFrom2_0To2_1 number of all storage upgrades: 46 success rate: 100% UpgradeStorageFrom2_1To2_2 number of all storage upgrades: 83 success rate: 100% UpgradeStorageFrom2_2To2_3 number of all storage upgrades: 116 success rate: 100% There are only 7 failed initializations for UpgradeStorageFrom1_0To2_0, but number of total failures is 9. It seems there can be something else which breaks the initialization and is not covered by individual keys.