#Prometheus Internals | Prometheus Storage and Security

#Prometheus Internals | Prometheus Storage and Security
Prometheus Storage
Prometheus Security
TLS & Authentication on Prometheus Server
Prometheus includes a local on-disk time series database, but also optionally integrates with remote storage systems.
Local storage
Prometheus's local time series database stores time series data in a custom format on disk. Ingested samples are grouped into blocks of two hours. Each two-hour block consists of a directory containing one or more chunk files that contain all time series samples for that window of time. It also consist a metadata file and index file (which indexes metric names and labels to time series in the chunk files). When series are deleted via the API, deletion records are stored in separate tombstone files (instead of deleting the data immediately from the chunk files). The block for currently incoming samples is kept in memory and not fully persisted yet. It is secured against crashes by a write-ahead-log (WAL) that can be replayed when the Prometheus server restarts after a crash.
Write-ahead log files are stored in the wal directory in 128MB segments. These files contain raw data that has not been compacted yet, so they are significantly larger than regular block files. Prometheus will keep a minimum of 3 WAL files, however may be more than three WAL files, since it needs to keep at least two hours worth of raw data.
Limitation of the Local storage
It is not clustered or replicated. Not arbitrarily scalable or durable in the face of disk or node outages and should be treated as you would any other kind of single node database. Using RAID for disk availability, snapshots for backups, capacity planning, etc, is recommended for improved durability.
With proper storage durability and planning storing years of data in the local storage is possible.
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[jitendrathota]

Hi team if possible alertmanager integration with Ms team instead of slack