# Cluster Metrics

MinIO collects the following metrics at the cluster level.
Metrics may include one or more labels, such as the server that calculated that metric.

These metrics can be obtained from any MinIO server once per collection by using the following URL:

```shell
https://HOSTNAME:PORT/minio/v2/metrics/cluster
```

Replace ``HOSTNAME:PORT`` with the hostname of your MinIO deployment.

// serialize will serialize the provided keys and values.
// The function will panic if keys/value slices aren't of equal length.
// Payload size can give an indication of expected payload size.
// If plSize is <= 0 it will be calculated.
func (x *xlMetaInlineData) serialize(plSize int, keys [][]byte, vals [][]byte) {
	if len(keys) != len(vals) {
		panic(fmt.Errorf("xlMetaInlineData.serialize: keys/value number mismatch"))
	}
	if len(keys) == 0 {

//  	[ subresource, if present. For example "?acl", "?location", "?logging", or "?torrent"];
//
// CanonicalizedProtocolHeaders = <described below>

// doesSignV2Match - Verify authorization header with calculated header in accordance with
//     - http://docs.aws.amazon.com/AmazonS3/latest/dev/auth-request-sig-v2.html
// returns true if matches, false otherwise. if error is not nil then it is always false

    void testMaxDelayLimit() {
        // Given
        SmbOperationException.RetryPolicy policy = new SmbOperationException.RetryPolicy(10, 1000, 5000, 2.0, true);

        // When - Calculate delays for increasing attempts
        long delay1 = policy.getDelayMs(1);
        long delay2 = policy.getDelayMs(2);
        long delay3 = policy.getDelayMs(3);
        long delay4 = policy.getDelayMs(4);

- Erasure set is a single erasure coding unit within a MinIO deployment. An object is sharded within an erasure set. Erasure set size is automatically calculated based on the number of drives. MinIO supports unlimited number of drives but each erasure set can be up to 16 drives and a minimum of 2 drives.

        pos += 4;
        // fileId (16 bytes)
        byte[] fid = fileId != null ? fileId : new byte[16];
        System.arraycopy(fid, 0, buf, pos, 16);
        pos += 16;

        // Calculate offsets relative to start of SMB2 header
        int inputOffsetField = inputCount > 0 ? payloadStart : 0;
        int outputOffsetField = outputCount > 0 ? payloadStart + inputCount : 0;

        return new Statistics(name, getState(), totalCalls.get(), totalSuccesses.get(), totalFailures.get(), rejectedCalls.get(),
                consecutiveFailures.get(), getSuccessRate());
    }

    /**
     * Calculate success rate
     *
     * @return success rate (0.0 to 1.0)
     */
    private double getSuccessRate() {
        long total = totalCalls.get();
        if (total == 0) {
            return 1.0;

        // Then
        assertNotNull(response);
        assertTrue(response instanceof Smb2TreeDisconnectResponse);
        verify(mockContext, times(1)).getConfig();
    }

    @Test
    @DisplayName("Should calculate correct message size")
    void testSize() {
        // Given
        Configuration mockConfig = mock(Configuration.class);
        Smb2TreeDisconnectRequest request = new Smb2TreeDisconnectRequest(mockConfig);

        assertEquals(0, qrList.getStart());
        assertEquals(10, qrList.getPageSize());
        assertEquals(0, qrList.getOffset());

        // Page info should be calculated (allRecordCount=100, pageSize=10 => 10 pages)
        // But since size() < pageSize, collapsing logic applies and allPageCount becomes currentPageNumber

        CIFSException ex = assertThrows(CIFSException.class, () -> ctx.calculateMIC(data));
        assertTrue(ex.getMessage().contains("Failed to calculate MIC"));
    }

    @Test
    @DisplayName("calculateMIC with null data throws NPE")
    void calculateMIC_nullData() {
        assertThrows(NullPointerException.class, () -> ctx.calculateMIC(null));
    }