Enable `replaceTimestamp` by default

[Camille Louédoc-Eyriès]

Changes in the upstream Loki project require us to activate the replaceTimestamp option, or otherwise, logs uploading will silently fail.
See #90 and #75

I suggest enabling this option by default and adding a warning in the option's description as to why users should not turn it off.

I can contribute a PR for this.
Thank you for your attention.

Checklist

• Modify index.js ✓ c0d23d2 Edit
• Running GitHub Actions for index.js ✓ Edit
• Modify README.md ✓ e279641 Edit
• Running GitHub Actions for README.md ✓ Edit

[sweep-ai]

🚀 Here's the PR! #145

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Step 1: 🔎 Searching

I found the following snippets in your repository. I will now analyze these snippets and come up with a plan.

Some code snippets I think are relevant in decreasing order of relevance (click to expand). If some file is missing from here, you can mention the path in the ticket description.

winston-loki/README.md

Lines 16 to 30 in 88399c8

  
 ### Options 
 LokiTransport() takes a Javascript object as an input. These are the options that are available, __required in bold__: 
  
 | **Parameter**      | **Description**                                           | **Example**            | **Default**   | 
 | ------------------ | --------------------------------------------------------- | -----------------------| ------------- | 
 | __`host`__         | URL for Grafana Loki                                      | http://127.0.0.1:3100  | null          | 
 | `interval`         | The interval at which batched logs are sent in seconds    | 30                     | 5             | 
 | `json`             | Use JSON instead of Protobuf for transport                | true                   | false         | 
 | `batching`         | If batching is not used, the logs are sent as they come   | true                   | true          | 
 | `clearOnError`     | Discard any logs that result in an error during transport | true                   | false         | 
 | `replaceTimestamp` | Replace any log timestamps with Date.now()                | true                   | false         | 
 | `labels`           | custom labels, key-value pairs                            | { module: 'http' }     | undefined     | 
 | `format`           | winston format (https://github.com/winstonjs/winston#formats) | simple()           | undefined     | 
 | `gracefulShutdown` | Enable/disable graceful shutdown (wait for any unsent batches) | false             | true          | 

winston-loki/index.js

Lines 10 to 36 in 88399c8

  */ 
 class LokiTransport extends Transport { 
   /** 
    * Creates an instance of LokiTransport. 
    * @param {*} options 
    * @memberof LokiTransport 
    */ 
   constructor (options) { 
     super(options) 
  
     // Pass all the given options to batcher 
     this.batcher = new Batcher({ 
       host: options.host, 
       basicAuth: options.basicAuth, 
       headers: options.headers || {}, 
       interval: options.interval, 
       json: options.json, 
       batching: options.batching !== false, 
       clearOnError: options.clearOnError, 
       onConnectionError: options.onConnectionError, 
       replaceTimestamp: options.replaceTimestamp, 
       gracefulShutdown: options.gracefulShutdown !== false, 
       timeout: options.timeout 
     }) 
  
     this.useCustomFormat = options.format !== undefined 
     this.labels = options.labels 

winston-loki/src/batcher.js

Lines 31 to 155 in 88399c8

   /** 
    * Creates an instance of Batcher. 
    * Starts the batching loop if enabled. 
    * @param {*} options 
    * @memberof Batcher 
    */ 
   constructor (options) { 
     // Load given options to the object 
     this.options = options 
  
     // Construct Grafana Loki push API url 
     const URL = this.loadUrl() 
     this.url = new URL(this.options.host + '/loki/api/v1/push') 
  
     // Parse basic auth parameters if given 
     if (options.basicAuth) { 
       const btoa = require('btoa') 
       const basicAuth = 'Basic ' + btoa(options.basicAuth) 
       this.options.headers = Object.assign(this.options.headers, { Authorization: basicAuth }) 
     } 
  
     // Define the batching intervals 
     this.interval = this.options.interval 
       ? Number(this.options.interval) * 1000 
       : 5000 
     this.circuitBreakerInterval = 60000 
  
     // Initialize the log batch 
     this.batch = { 
       streams: [] 
     } 
  
     // If snappy binaries have not been built, fallback to JSON transport 
     if (!this.options.json) { 
       try { 
         snappy = this.loadSnappy() 
       } catch (error) { 
         this.options.json = true 
       } 
       if (!snappy) { 
         this.options.json = true 
       } 
     } 
  
     // Define the content type headers for the POST request based on the data type 
     this.contentType = 'application/x-protobuf' 
     if (this.options.json) { 
       this.contentType = 'application/json' 
     } 
  
     this.batchesSending = 0 
     this.onBatchesFlushed = () => {} 
  
     // If batching is enabled, run the loop 
     this.options.batching && this.run() 
  
     if (this.options.gracefulShutdown) { 
       exitHook(callback => { 
         this.close(() => callback()) 
       }) 
     } 
   } 
  
   /** 
    * Marks the start of batch submitting. 
    * 
    * Must be called right before batcher starts sending logs. 
    */ 
   batchSending () { 
     this.batchesSending++ 
   } 
  
   /** 
    * Marks the end of batch submitting 
    * 
    * Must be called after the response from Grafana Loki push endpoint 
    * is received and completely processed, right before 
    * resolving/rejecting the promise. 
    */ 
   batchSent () { 
     if (--this.batchesSending) return 
  
     this.onBatchesFlushed() 
   } 
  
   /** 
    * Returns a promise that resolves after all the logs sent before 
    * via log(), info(), etc calls are sent to Grafana Loki push endpoint 
    * and the responses for all of them are received and processed. 
    * 
    * @returns {Promise} 
    */ 
   waitFlushed () { 
     return new Promise((resolve, reject) => { 
       if (!this.batchesSending && !this.batch.streams.length) { return resolve() } 
  
       this.onBatchesFlushed = () => { 
         this.onBatchesFlushed = () => {} 
         return resolve() 
       } 
     }) 
   } 
  
   /** 
    * Returns a promise that resolves after the given duration. 
    * 
    * @param {*} duration 
    * @returns {Promise} 
    */ 
   wait (duration) { 
     return new Promise(resolve => { 
       setTimeout(resolve, duration) 
     }) 
   } 
  
   /** 
    * Pushes logs into the batch. 
    * If logEntry is given, pushes it straight to this.sendBatchToLoki() 
    * 
    * @param {*} logEntry 
    */ 
   async pushLogEntry (logEntry) { 
     const noTimestamp = 
       logEntry && logEntry.entries && logEntry.entries[0].ts === undefined 
     // If user has decided to replace the given timestamps with a generated one, generate it 

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Step 2: ⌨️ Coding

• Modify index.js ✓ c0d23d2 Edit

Modify index.js with contents:
• In the `LokiTransport` class constructor, update the handling of the `replaceTimestamp` option to default to true if not provided. This can be achieved by modifying the line initializing the `replaceTimestamp` option to `replaceTimestamp: options.replaceTimestamp !== false`. This change ensures that unless explicitly set to false, `replaceTimestamp` will be true by default.

--- 
+++ 
@@ -27,7 +27,7 @@
       batching: options.batching !== false,
       clearOnError: options.clearOnError,
       onConnectionError: options.onConnectionError,
-      replaceTimestamp: options.replaceTimestamp,
+      replaceTimestamp: options.replaceTimestamp !== false,
       gracefulShutdown: options.gracefulShutdown !== false,
       timeout: options.timeout
     })

• Running GitHub Actions for index.js ✓ Edit

Check index.js with contents:

Ran GitHub Actions for c0d23d2b349b3598ea670458a70e3e385a214da8:

• Modify README.md ✓ e279641 Edit

Modify README.md with contents:
• Update the description of the `replaceTimestamp` option in the options table to indicate that it is enabled by default. Change the default value from `false` to `true`.
• Add a warning note under the `replaceTimestamp` option description: "Warning: Disabling `replaceTimestamp` may result in logs failing to upload due to recent changes in the upstream Loki project. It is recommended to leave this option enabled unless you have a specific reason to disable it."

--- 
+++ 
@@ -24,7 +24,7 @@
 | `json`             | Use JSON instead of Protobuf for transport                | true                   | false         |
 | `batching`         | If batching is not used, the logs are sent as they come   | true                   | true          |
 | `clearOnError`     | Discard any logs that result in an error during transport | true                   | false         |
-| `replaceTimestamp` | Replace any log timestamps with Date.now()                | true                   | false         |
+| `replaceTimestamp` | Replace any log timestamps with Date.now(). Warning: Disabling `replaceTimestamp` may result in logs failing to upload due to recent changes in the upstream Loki project. It is recommended to leave this option enabled unless you have a specific reason to disable it. | true                   | true          |
 | `labels`           | custom labels, key-value pairs                            | { module: 'http' }     | undefined     |
 | `format`           | winston format (https://github.com/winstonjs/winston#formats) | simple()           | undefined     |
 | `gracefulShutdown` | Enable/disable graceful shutdown (wait for any unsent batches) | false             | true          |

• Running GitHub Actions for README.md ✓ Edit

Check README.md with contents:

Ran GitHub Actions for e2796413cbd3fa63c98b0b866a2de20fa950815b:

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Step 3: 🔁 Code Review

I have finished reviewing the code for completeness. I did not find errors for sweep/enable_replacetimestamp_by_default.

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