fix: suppress info message for undefined maxRequestsPerCrawl (apify#3237)

### Issue
apify#3138

### Summary
I was able to recreate the issue and also observed `undefined` in the
info log:
```
INFO  CheerioCrawler: The number of requests enqueued by the crawler reached the maxRequestsPerCrawl limit of undefined requests and no further requests will be added.
```

With this PR, the log message will reflect the limit it is reporting on.

### Example - `maxRequestsPerCrawl` is defined and triggered

Snippet:
```
const crawler = new CheerioCrawler({
    maxRequestsPerCrawl: 1,
    requestHandler: async ({ request, log, pushData, enqueueLinks }) => {
        log.info(`Handling url ${request.url}`);
        await pushData({ url: request.url })
        await enqueueLinks({
            selector: 'a[href*="apify.com"]',
            strategy: EnqueueStrategy.SameDomain,
        });
    },
});
```

Logs:
```
INFO  System info {"apifyVersion":"3.5.1","apifyClientVersion":"2.19.0","crawleeVersion":"3.15.2","osType":"Darwin","nodeVersion":"v22.17.0"}
INFO  CheerioCrawler: Starting the crawler.
INFO  CheerioCrawler: Handling url https://www.apify.com
INFO  CheerioCrawler: Crawler reached the maxRequestsPerCrawl limit of 1 requests and will shut down soon. Requests that are in progress will be allowed to finish.
INFO  CheerioCrawler: Earlier, the crawler reached the maxRequestsPerCrawl limit of 1 requests and all requests that were in progress at that time have now finished. In total, the crawler processed 1 requests and will shut down.
INFO  CheerioCrawler: Final request statistics: {"requestsFinished":1,"requestsFailed":0,"retryHistogram":[1],"requestAvgFailedDurationMillis":null,"requestAvgFinishedDurationMillis":861,"requestsFinishedPerMinute":58,"requestsFailedPerMinute":0,"requestTotalDurationMillis":861,"requestsTotal":1,"crawlerRuntimeMillis":1028}
INFO  CheerioCrawler: Finished! Total 1 requests: 1 succeeded, 0 failed. {"terminal":true}
```

### Example - `enqueueLinks` is defined and triggered

Snippet:
```
const crawler = new CheerioCrawler({
    requestHandler: async ({ request, log, pushData, enqueueLinks }) => {
        log.info(`Handling url ${request.url}`);
        await pushData({ url: request.url })
        await enqueueLinks({
            selector: 'a[href*="apify.com"]',
            strategy: EnqueueStrategy.SameDomain,
            limit: 1
        });
    },
});
```

Logs:
```
INFO  System info {"apifyVersion":"3.5.1","apifyClientVersion":"2.19.0","crawleeVersion":"3.15.2","osType":"Darwin","nodeVersion":"v22.17.0"}
INFO  CheerioCrawler: Starting the crawler.
INFO  CheerioCrawler: Handling url https://www.apify.com
INFO  CheerioCrawler: The number of requests enqueued by the crawler reached the enqueueLinks limit.
... ^ repeated many times
INFO  CheerioCrawler: Handling url https://console.apify.com/sign-up
INFO  CheerioCrawler: All requests from the queue have been processed, the crawler will shut down.
INFO  CheerioCrawler: Final request statistics: {"requestsFinished":2,"requestsFailed":0,"retryHistogram":[2],"requestAvgFailedDurationMillis":null,"requestAvgFinishedDurationMillis":517,"requestsFinishedPerMinute":99,"requestsFailedPerMinute":0,"requestTotalDurationMillis":1034,"requestsTotal":2,"crawlerRuntimeMillis":1217}
INFO  CheerioCrawler: Finished! Total 2 requests: 2 succeeded, 0 failed. {"terminal":true}
```

### Example - `maxRequestsPerCrawl` and `enqueueLinks` are both defined
and triggered

Snippet:
```
const crawler = new CheerioCrawler({
    maxRequestsPerCrawl: 1,
    requestHandler: async ({ request, log, pushData, enqueueLinks }) => {
        log.info(`Handling url ${request.url}`);
        await pushData({ url: request.url })
        await enqueueLinks({
            selector: 'a[href*="apify.com"]',
            strategy: EnqueueStrategy.SameDomain,
            limit: 1
        });
    },
});
```

Logs:
```
INFO  System info {"apifyVersion":"3.5.1","apifyClientVersion":"2.19.0","crawleeVersion":"3.15.2","osType":"Darwin","nodeVersion":"v22.17.0"}
INFO  CheerioCrawler: Starting the crawler.
INFO  CheerioCrawler: Handling url https://www.apify.com
INFO  CheerioCrawler: Crawler reached the maxRequestsPerCrawl limit of 1 requests and will shut down soon. Requests that are in progress will be allowed to finish.
INFO  CheerioCrawler: Earlier, the crawler reached the maxRequestsPerCrawl limit of 1 requests and all requests that were in progress at that time have now finished. In total, the crawler processed 1 requests and will shut down.
INFO  CheerioCrawler: Final request statistics: {"requestsFinished":1,"requestsFailed":0,"retryHistogram":[1],"requestAvgFailedDurationMillis":null,"requestAvgFinishedDurationMillis":801,"requestsFinishedPerMinute":62,"requestsFailedPerMinute":0,"requestTotalDurationMillis":801,"requestsTotal":1,"crawlerRuntimeMillis":968}
INFO  CheerioCrawler: Finished! Total 1 requests: 1 succeeded, 0 failed. {"terminal":true}
```

Author: rafalaidlaw

packages/basic-crawler/src/internals/basic-crawler.ts

@@ -1144,6 +1144,13 @@ export class BasicCrawler<Context extends CrawlingContext = BasicCrawlingContext
             this.shouldLogMaxEnqueuedRequestsExceeded = false;
         }
 
+        if (options.reason === 'enqueueLimit') {
+            const enqueuedRequestLimit = this.calculateEnqueuedRequestLimit();
+            if (enqueuedRequestLimit === undefined || enqueuedRequestLimit !== 0) {
+                this.log.info('The number of requests enqueued by the crawler reached the enqueueLinks limit.');
+            }
+        }
+
         await this.onSkippedRequest?.(options);
     }
 

packages/core/src/enqueue_links/enqueue_links.ts

@@ -490,7 +490,7 @@ export async function enqueueLinks(
 
     let requests = await createFilteredRequests();
     if (typeof limit === 'number' && limit < requests.length) {
-        await reportSkippedRequests(requests.slice(limit), 'limit');
+        await reportSkippedRequests(requests.slice(limit), 'enqueueLimit');
         requests = requests.slice(0, limit);
     }
 

packages/core/src/enqueue_links/shared.ts

@@ -47,7 +47,7 @@ export type RegExpObject = { regexp: RegExp } & Pick<
 
 export type RegExpInput = RegExp | RegExpObject;
 
-export type SkippedRequestReason = 'robotsTxt' | 'limit' | 'filters' | 'redirect' | 'depth';
+export type SkippedRequestReason = 'robotsTxt' | 'limit' | 'enqueueLimit' | 'filters' | 'redirect' | 'depth';
 
 export type SkippedRequestCallback = (args: { url: string; reason: SkippedRequestReason }) => Awaitable<void>;