The context parameter ctx is accepted but never used in this function. The function performs sequential SNMP walks that could potentially be long-running operations, but there's no mechanism to respect context cancellation. Consider checking ctx.Done() between iterations or passing the context to the SNMP operations if supported.

The variable allPdus is initialized on line 209 but never used before being reassigned in the loop starting at line 229. Consider removing the initialization on line 209 and directly assigning allPdus in the loop, or clarify the intended logic.

The logic of wrapping pdus in another slice with append(results[i], pdus) and then unwrapping it later (line 229-233) is unnecessarily complex. Since each iteration produces one []gosnmp.SnmpPDU, you could simplify by storing pdus directly: results[i] = pdus on line 226, and then allPdus = append(allPdus, pduGroup) on line 231.

[nitpick] The buffer size calculation len(items)+10 appears arbitrary. If this is meant to prevent blocking, consider using a more justified value or adding a comment explaining why "+10" is appropriate for this use case. Alternatively, consider making this configurable or calculating based on the number of agents.

MaxRepetitions is an SNMP protocol parameter that specifies how many variable bindings should be returned per GetBulk request, not how many OIDs should be batched together. Using it as the batch size for collector batching is a semantic mismatch.

The original hardcoded value of 60 may have been chosen specifically for batching operations. If configurability is desired, consider:

1. Adding a separate BatchSize configuration parameter for collector batching
2. Using a different default value if MaxRepetitions was intended for a different purpose
3. Documenting why MaxRepetitions is being repurposed for batching if this is intentional

Note: The default value of 10 when MaxRepetitions <= 0 is significantly smaller than the original 60, which could impact collection performance.

[nitpick] The comment states "这里不需要 acquire 锁，因为上层 performSNMPDiscovery 已经持有锁了" (no need to acquire lock here because the upper layer performSNMPDiscovery already holds the lock).

While this is factually correct and explains why no lock acquisition is needed here, this comment is documenting the absence of code that was never present in the first place (even in the concurrent version that was removed). The comment might be more confusing than helpful, as it could make readers wonder if a lock was considered or removed.

Consider removing this comment or rephrasing it to focus on the sequential execution model, e.g., "顺序执行，复用上层的锁" (sequential execution, reusing the upper-layer lock).

The ctx context.Context parameter is not used in this function. Since the function performs sequential SNMP operations that could take a significant amount of time, it should respect the context for cancellation.

Consider adding context cancellation checks in the loop, e.g.:

for i, oidStr := range oidStrings {
    select {
    case <-ctx.Done():
        return nil, fmt.Errorf("SNMP walk was canceled or timed out: %w", ctx.Err())
    default:
    }
    // ... existing code
}

Note that performZabbixDependentDiscovery already implements proper context handling (lines 260-262), so this function should follow the same pattern for consistency.

The comment states "尝试多种形式的OID匹配（有没有前导点）" (try multiple forms of OID matching with/without leading dot), but the implementation only tries one form - the OID without a leading dot.

The code normalizes both the response OIDs (line 280) and request OIDs (line 289) by removing leading dots, then only checks the normalized form. While this approach should work in most cases, it doesn't actually try "multiple forms" as the comment suggests.

Consider either:

1. Updating the comment to reflect that both sides are normalized, or
2. Implementing a fallback to try the original oid if oidNoDot doesn't match (though this may not be necessary if normalization is consistent)

The intermediate array structure results := make([][][]gosnmp.SnmpPDU, len(oidStrings)) combined with results[i] = append(results[i], pdus) creates a three-dimensional array where each element is a slice containing exactly one []gosnmp.SnmpPDU.

This can be simplified to:

results := make([][]gosnmp.SnmpPDU, len(oidStrings))
// ...
results[i] = pdus

Then the final loop becomes:

allPdus = results
return allPdus, nil

This simplification makes the code more maintainable and easier to understand, since the extra nesting level serves no purpose in the sequential execution model.

[nitpick] The buffer size is set to len(items)+10, but the rationale for adding exactly 10 extra slots is unclear.

Since the number of results that will be sent to the channel should equal the number of items (one CollectionResult per item), the buffer size could simply be len(items). The additional 10 slots don't provide a clear benefit and make the buffer sizing logic arbitrary.

Consider either:

1. Using exactly len(items) as the buffer size, or
2. Adding a comment explaining why the extra 10 slots are needed (e.g., if there's a specific edge case being handled)