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Subhra264 08d12f8571 feat: introduce reports in backend and replace TRIGGERS with infra::scheduler (#3086)
## Reports
Both `ZO_CHROME_ENABLED` and `ZO_SMTP_ENABLED` ENV variables need to be
`true` for reports to work.

**Report APIs -**
```
POST /api/{org_id}/reports
PUT /api/{org_id}/reports/{report_name}
GET /api/{org_id}/reports
GET /api/{org_id}/reports/{report_name}
DELETE /api/{org_id}/reports/{report_name}
PUT /api/{org_id}/reports/{report_name}/enable?value=<true|false>
```

**Report body**
```
{
  "createdAt": "2024-03-23T09:46:32.913574782Z",
  "dashboards": [
    {
      "dashboard": "7177215109754781699",
      "folder": "default",
      "tabs": [
        "default"
      ],
      "timerange": {
        "from": 0,
        "period": "1h",
        "to": 0,
        "type": "relative"
      },
      "variables": []
    }
  ],
  "description": "Report description",
  "destinations": [
    {
      "email": "mail@gmail.com"
    }
  ],
  "enabled": false,
  "frequency": {
    "cron": "",
    "interval": 1,
    "type": "weeks"
  },
  "lastEditedBy": "root@example.com",
  "mediaType": "pdf",
  "message": "Email message",
  "name": "report_name",
  "orgId": "default",
  "owner": "root@example.com",
  "password": "ComplexPass#123",
  "start": 1711187192913571,
  "timezone": "Asia/Calcutta",
  "timezoneOffset": 330,
  "title": "Email subject",
  "user": "root@example.com"
}
```

**ENVs**
| ENV |  Description | 
|------|---------------|
| `ZO_CHROME_ENABLED` | Must be `true` for reports, Default - `false` |
| `ZO_CHROME_PATH` | If chrome is enabled, custom `chrome` executable
path can be specified. If not specified, it looks for chrome executable
in default locations. If still not found, it automatically downloads a
good known version of `chromium`. |
| `ZO_CHROME_CHECK_DEFAULT_PATH` | If `false`, it does not look for
chromium in default locations, Default is `true`. |
| `ZO_CHROME_DOWNLOAD_PATH` | If chromium can not be found in default
locations and also `ZO_CHROME_PATH` is not specified, it downloads the
system specific chromium in the given path. Default is `./download`
(gitignored). `chromium` is downloaded for the first time only,
afterwords, `chromium` is fetched from the given path. If there is any
error regarding download of `chromium`, delete the download folder as it
might be in a bad state. |
| `ZO_CHROME_NO_SANDBOX` | If `true`, it launches chromium in
`no-sandbox` environment. Default is `false` |
| `ZO_CHROME_SLEEP_SECS` | Specify the number of seconds the
`service::dashboards::reports::generate_report()` will wait to load all
the data in the headless chromium dashboard. Default is `20` seconds. |
| `ZO_CHROME_WINDOW_WIDTH` | Specifies the width of the headless
chromium browser. Default is `1370` |
| `ZO_CHROME_WINDOW_HEIGHT` | Specifies the height of the headless
chromium browser. Default is `730` |

## Scheduler

Currently `Scheduler` is implemented for only `Sqlite`, `Postgres` and
`MySql`.
**API**
```rust
pub trait Scheduler: Sync + Send + 'static {
    async fn create_table(&self) -> Result<()>;
    async fn create_table_index(&self) -> Result<()>;
    async fn push(&self, trigger: Trigger) -> Result<()>;
    async fn delete(&self, org: &str, module: TriggerModule, key: &str) -> Result<()>;
    async fn update_status(
        &self,
        org: &str,
        module: TriggerModule,
        key: &str,
        status: TriggerStatus,
        retries: i32,
    ) -> Result<()>;
    async fn update_trigger(&self, trigger: Trigger) -> Result<()>;
    async fn pull(
        &self,
        concurrency: i64,
        alert_timeout: i64,
        report_timeout: i64,
    ) -> Result<Vec<Trigger>>;
    async fn clean_complete(&self, interval: u64);
    async fn watch_timeout(&self, interval: u64);
    async fn len_module(&self, module: TriggerModule) -> usize;
    async fn len(&self) -> usize;
    async fn is_empty(&self) -> bool;
    async fn clear(&self) -> Result<()>;
}
```

**ENVs**
| ENV |  Description | 
|------|---------------|
| `ZO_ALERT_SCHEDULE_CONCURRENCY` | The number of `scheduled_jobs` the
`alert_manager` can process at a time. Default is `5` |
| `ZO_ALERT_SCHEDULE_TIMEOUT` | Visibility timeout for alerts. Default
is `90` seconds |
| `ZO_REPORT_SCHEDULE_TIMEOUT` | Visibility timeout for reports. Default
is `300` seconds |
| `ZO_SCHEDULER_MAX_RETRIES` | Maximum number of retries that will be
made for a `scheduled_job`. Default is `3` |
| `ZO_SCHEDULER_CLEAN_INTERVAL` | Time interval after which the
`Scheduler` will clean up the queue. Default is `30` seconds |
| `ZO_SCHEDULER_WATCH_INTERVAL` | Time interval after which the
`Scheduler` will watch for timeout for `scheduled_jobs`. Default is `30`
seconds. |

**Workflow**

![openobserve_scheduler_workflow](https://github.com/openobserve/openobserve/assets/59690052/68beb43b-d04f-49dc-9006-a30942acd99b)
2024-03-25 18:24:14 +05:30

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# Commonly files
.DS_Store
.history
report.json
flamegraph.svg
flamegraph.html
# Generated by Cargo
# will have compiled files and executables
/examples/
/target/
/bin/
# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
# Cargo.lock
# These are backup files generated by rustfmt
**/*.rs.bk
/tmp/
/data/
/.idea/
/.vscode
/.env
/.env*
/integration-tests
/download/
#web distribution
/web/dist
/web/.env